#include<stdio.h>
main(){
    int N;
    int C[100];
    scanf("%d",&N);
    int sum = 0;
    int count = 0;
    for(int i = 0;i < N;i++){
        scanf("%d",&C[i]);
        sum += C[i];
    }
    sum /= 10;
    for(int i = 0;i < N;i++){
        if(C[i] <= sum){count++;}
    }
    printf("%d\n",count*30);
}