#include <bits/stdc++.h>
using namespace std;
bool debug = false;
const int dx[] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
const int dy[] = {1, 0, -1, 0, -1, 1, 1, -1, 0};
template <typename X>
inline X square(const X& a) {
  return a * a;
}
int scan_d() {
  bool minus = false;
  int result = 0;
  char ch;
  ch = getchar();
  while (true) {
    if (ch == '-') break;
    if (ch >= '0' && ch <= '9') break;
    ch = getchar();
  }
  if (ch == '-')
    minus = true;
  else
    result = ch - '0';
  while (true) {
    ch = getchar();
    if (ch < '0' || ch > '9') break;
    result = (result << 3) + (result << 1) + (ch - '0');
  }
  if (minus)
    return -result;
  else
    return result;
}
long scan_ld() {
  bool minus = false;
  long result = 0;
  char ch;
  ch = getchar();
  while (true) {
    if (ch == '-') break;
    if (ch >= '0' && ch <= '9') break;
    ch = getchar();
  }
  if (ch == '-')
    minus = true;
  else
    result = ch - '0';
  while (true) {
    ch = getchar();
    if (ch < '0' || ch > '9') break;
    result = (result << 3) + (result << 1) + (ch - '0');
  }
  if (minus)
    return -result;
  else
    return result;
}
long long scan_lld() {
  bool minus = false;
  long long result = 0;
  char ch;
  ch = getchar();
  while (true) {
    if (ch == '-') break;
    if (ch >= '0' && ch <= '9') break;
    ch = getchar();
  }
  if (ch == '-')
    minus = true;
  else
    result = ch - '0';
  while (true) {
    ch = getchar();
    if (ch < '0' || ch > '9') break;
    result = (result << 3) + (result << 1) + (ch - '0');
  }
  if (minus)
    return -result;
  else
    return result;
}
long long unsigned scan_llu() {
  long long unsigned result = 0;
  char ch;
  ch = getchar();
  while (true) {
    if (ch == '-') break;
    if (ch >= '0' && ch <= '9') break;
    ch = getchar();
  }
  result = ch - '0';
  while (true) {
    ch = getchar();
    if (ch < '0' || ch > '9') break;
    result = (result << 3) + (result << 1) + (ch - '0');
  }
  return result;
}
void print_d(int n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 10;
  char output_buffer[10];
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 10);
}
void print_ld(long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 11;
  char output_buffer[11];
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 11);
}
void print_lld(long long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 21;
  char output_buffer[21];
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 21);
}
void print_llu(long long unsigned n) {
  int i = 21;
  char output_buffer[21];
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 21);
}
void println_d(int n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 10;
  char output_buffer[11];
  output_buffer[10] = '\n';
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 11);
}
void println_ld(long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 11;
  char output_buffer[12];
  output_buffer[11] = '\n';
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 12);
}
void println_lld(long long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 21;
  char output_buffer[22];
  output_buffer[21] = '\n';
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 22);
}
void println_llu(long long unsigned n) {
  int i = 21;
  char output_buffer[22];
  output_buffer[21] = '\n';
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 22);
}
char sp;
void printsp_d(int n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 10;
  char output_buffer[11];
  output_buffer[10] = sp;
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 11);
}
void printsp_ld(long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 11;
  char output_buffer[12];
  output_buffer[11] = sp;
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 12);
}
void printsp_lld(long long n) {
  if (n < 0) {
    n = -n;
    putchar('-');
  }
  int i = 21;
  char output_buffer[22];
  output_buffer[21] = sp;
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 22);
}
void printsp_llu(long long unsigned n) {
  int i = 21;
  char output_buffer[22];
  output_buffer[21] = sp;
  do {
    output_buffer[--i] = (n % 10) + '0';
    n /= 10;
  } while (n);
  do {
    putchar(output_buffer[i]);
  } while (++i < 22);
}
int main() {
  long long unsigned n, k;
  n = scan_llu();
  k = scan_llu();
  if (k == 1) {
    println_llu(n);
    return 0;
  }
  int x = 0;
  while (n) {
    x++;
    n >>= 1;
  }
  n = 1LL << x;
  println_llu(n - 1);
  return 0;
}
