#include <stdio.h>
int main(void){
    int n;
    scanf( "%d", &n );
    int a;
    int i = 0;
    long sum = 0;
    for( i = 0; i < n; i++ ){
        scanf( "%d", &a );
        sum += (long)a;
    }
    int v;
    scanf( "%d", &v );
    printf( "%d\n", sum - v );
}