#include <bits/stdc++.h>
int main() {
  char s[1000000], c;
  int x = 0, y = 0, sum = 0, d;
  scanf("%d", &d);
  for (int i = 0; i < d; i++) {
    scanf(" %c", &c);
    s[i] = c;
  }
  for (int i = 0; i < strlen(s); i++) {
    if (s[i] == 'L') x--;
    if (s[i] == 'R') y++;
  }
  for (int i = x; i <= y; i++) {
    sum++;
  }
  printf("%d\n", sum);
  return 0;
}
