#include <bits/stdc++.h>

using namespace std;
typedef __int128 LL;
const int N = 1000010;
int n, p;
LL f[N];
LL max(LL a, LL b) {
    if (a >= b) return a;
    return b;
}
int main() {
    cin >> n >> p;
    LL s = 0, mx = -1e36;
    for (int i = 1; i <= n; i++) {
        int x;
        cin >> x;
        s = max(s, 0) + x;
        mx = max(mx, s);
        f[i] = mx;
    }
    LL res = f[1], score = f[1] * 2;
    for (int i = 2; i <= n; i++) {
        res = max(res, score);
        if (f[i] > 0) score += f[i];
    }
    printf("%lld\n", res % p);
    return 0;
}