world cup 더블릿

#include <stdio.h>
 
int main() {
    int t, n;
    scanf("%d %d", &t, &n);
        
    int tmp = 0;
    while (t--) {
        char country[10];
        int score;
        scanf("%s %d", country, &score);
        tmp += score;
    }
 
    int rst = 3 * n - tmp;
    printf("%d", rst);
}