#include <bits/stdc++.h>
using namespace std;

const int N = 1e5+5;

int main() {
  int n;
  scanf("%d",&n);
  static long long sum[N];
  for (int i = 1; i <= n; i++) {
    int a;
    scanf("%d",&a);
    sum[i] = sum[i-1]+a;
  }
  for (int l,r; scanf("%d%d",&l,&r) == 2;) {
    printf("%lld\n",sum[r]-sum[l-1]);
  }
  return 0;
}