#include    <stdio.h>

int main(void)
{
    int     N;
    int     C[1000000];
    int     i, l;
    long    sum;

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

    l = 0;
    for (i = 0; i < N; i++) {
        if (C[i] <= (sum / 10.0)) {
            l++;
        }
    }

    printf("%d\n", 30 * l);

    return 0;
}