C++ :

#include<bits/stdc++.h>
using namespace std;
#define int long long
int a[100005];
signed main(){
	int  n,t;
	__int128 summ=0;
	cin>>n>>t;
	for(int i=1;i<=n;i++) {
		cin>>a[i];
		summ += a[i];
	}
	t = t%summ;
	if(t==0) cout<<n;
	else{
	
	summ = 0;
	for(int i=1;i<=n;i++){
		summ+=a[i];
		if(summ>=t){
			cout<<i;
			break;
		}
	}}
	return 0;
}