#include <bits/stdc++.h>
using namespace std;
 
void executeTime() {
    cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " secs";
}
 
int main() {
 
    int n; cin >> n;
 
    int x, y; cin >> x >> y;
 
    vector<int> v(n);
    for (auto &x : v) {
        cin >> x;
    }
 
 
    unordered_map<int, int> mp;
    mp[0]++;
 
    int curr = 0, ans = 0;
    for (int j = 0; j < n; j++) {
        curr += (v[j] == x ? 1 : -1);
        ans += mp[curr];
 
        mp[curr]++;
    }
 
    cout << ans << endl;
 
    executeTime();
    return 0;
}

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