#include <stdio.h>

#define MAX_N 1001
int n, s, max_s;
int d[MAX_N];
int sums[MAX_N];

int main() {
    scanf("%d%d", &n, &s);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &d[i]);
    }

    sums[0] = s;
    for (int i = 1; i <= n; i++) {
        sums[i] = sums[i - 1] + d[i];
    }

    for (int i = 0; i <= n; i++) {
        if (max_s < sums[i])
            max_s = sums[i];
    }

    printf("%d\n", max_s);


    return 0;
}