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, k;
        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]++;
        }
        cout << count << '\n';
    return 0;
}