#include <bits/stdc++.h>   int x[100001] = {0};   int main() {     int i, n;     scanf( %d , &n);     for (int i = 1; i <= n; ++i) {       scanf( %d , &x[i]);     }     int sum = 0;     int cn = 0;     for (i = 0; i < n; i++) {       sum = sum + x[i] - x[i + 1];       if (sum < 0) {         do {           cn++;           sum++;         } while (sum < 0);       }     }     printf( %d , cn);     return 0;   }   