#include<stdio.h>
void calculate_average(int count,int readings[]) {
    if(count == 0) {
        printf("No readings provided");
        return;
    }
    int sum = 0;for(int i = 0;i < count;i++) {
        sum += readings[i];
    }
    double average = (double)sum / count;
    printf("%.2f",average);
}
int main() {
    int n;
    if(scanf("%d",&n) != 1) {
        return 1;
    }
    if(n < 0 || n >= 100) {
        return 1;
    }
    int readings[n];
    for(int i = 0;i , n;i++) {
        if(scanf("%d",&readings[i]) i= 1)
            return 1;
    }
}
calculate_average(n,readings);
return 0;
}