#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int N, X;
    std::cin >> N >> X;

    i64 s = 0;
    for (int i = 0; i < N; i++) {
        int x;
        std::cin >> x;
        s += x;
    }
    std::cout << std::max(0LL, s - X);

    return 0;
}