#include<bits/stdc++.h>
using namespace std;
#define int long long
const int maxn=2e5+5;
int a[maxn],n,k;
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> k;
int sum = 0;
for(int i = 0; i < n; i++)
{
cin >> a[i];
sum += a[i];
}
if (sum < k)
{
cout << -1;
return 0;
}
int res = n;
int dis = 1;
sum = a[0];
for (int i = 0, j = 1; i < n; )
{
while (i == j || sum < k)
{
sum += a[j++];
dis++;
if (j == n) j = 0;
}
res=min(res,dis);
sum -= a[i++]; dis--;
}
cout << res;
}
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