#include <stdio.h>

float f(int x)//实现遍历统计短信费用的函数
{
    int arr[x];
    int i = 0;
    for (i = 0; i < x; i++)
    {
        scanf("%d ", &arr[i]);
    }
    float sum = 0;
    for (i = 0; i < x; i++)
    {
        float charge = 0.1;
        if (arr[i] > 60)
        {
            charge = 0.2;
        }
        sum += charge;
    }
    return sum;
}

int main() {
    int n = 0;//短信的条数
    scanf("%d", &n);
    float result = 0;
    result = f(n);//调用函数
    printf("%.1f\n", result);
    return 0;
}