#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
using namespace std;
int main(){
    vector<long long>   vc;
    long long N,M,x;
    cin >> N >> M;
    for(long long i=0;i<N;i++){
        cin >> x;
        M-=x;
        if(M<=0){
            cout << i;
            break;
        }
    }
    return 0;
}