#include <bits/stdc++.h>
const double eps = 1e-6;
using namespace std;
inline long long read() {
  char ch = getchar();
  long long s = 0, w = 1;
  while (ch < 48 || ch > 57) {
    if (ch == '-') w = -1;
    ch = getchar();
  }
  while (ch >= 48 && ch <= 57) {
    s = (s << 1) + (s << 3) + (ch ^ 48);
    ch = getchar();
  }
  return s * w;
}
inline void write(long long x) {
  if (x < 0) putchar('-'), x = -x;
  if (x > 9) write(x / 10);
  putchar(x % 10 + 48);
}
long long n, a[200005];
int main() {
  cin >> n;
  for (register long long i = 1; i <= n; i++) a[i] = read();
  long long sum = abs(a[1]);
  for (register long long i = 2; i <= n; i++) sum += abs(a[i] - a[i - 1]);
  cout << sum << endl;
  return 0;
}
