CDVR3.5

#include <bits/stdc++.h>
using namespace std;
const int mxn = 2e5;
//#define Kin

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

#ifdef Kin
    (void)!freopen("input.txt", "r", stdin);
    (void)!freopen("output.txt", "w", stdout);
#endif

    long long n, x;
    cin >> n >> x;
    long long sum = 0, count = 0;
    map<long long, long long> mp;
    mp[0]++;
    while (n--)
    {
        long long a;
        cin >> a;
        sum += a;
        count += mp[sum - x];
        mp[sum]++;
    }
    if (count)
        cout << count << '\n';
    else
        cout << -1;

    return 0;
}