#include <stdio.h>

int main(){
    int N, yuki, sum = 0;
    int num[10000], i;

    scanf("%d\n", &N);
    for(i = 0; i < N; i++){
        scanf("%d ", &num[i]);
        sum += num[i];
    }
    scanf("%d", &yuki);

    printf("%d\n", sum - yuki);

    return 0;
}