#include <bits/stdc++.h>
#define in freopen("input.txt","r",stdin);
#define out freopen("output.txt","w",stdout);
using namespace std;
int main()
{
    //in;
    //out;
    int a , b[1000005] , i , j;
    cin >> a;
    for( i = 1; i <= a; i ++ ){
       cin >> b[i];
    }
    int ind1 = 1 , ind2 = a ,ans = 0;
    while( ind1 < ind2 ){
      if( b[ind1] > b[ind2] ){
         b[ind2 - 1] = b[ind2] + b[ind2 - 1];
         ind2 --;
         ans ++;
      }
      else if( b[ind1] < b[ind2] ){
         b[ind1 + 1] = b[ind1] + b[ind1 + 1];
         ind1 ++;
         ans ++;
      }
      else{
         ind1 ++;
         ind2 --;
      }
    }
    cout << ans << endl;
}