#include <stdio.h>
int main(){
    //input
    int N;
    scanf("%d",&N);

    int C[100];
    for (int i = 0;i < N;i++){
        scanf("%d",&C[i]);
    }

    //total vote
    int vTotal = 0;
    for (int i = 0;i < N;i++){
        vTotal += C[i];
    }

    //total money to yukikoda
    int mTotal = 0;
    for (int i = 0;i < N;i++){
        if (C[i] <= 0.1*vTotal){
            mTotal += 30;
        }
    }

    //output
    printf("%d\n",mTotal);
    return 0;
}