#include <stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    int j;
    int m;
    float sum = 0;
    for (j = 0; j < n; j++) {
        scanf("%d", &m);
        if (m > 60) {
            sum += 0.2f;
        } else
            sum += 0.1f;
    }
    printf("%.1f", sum);
    return 0;
}