def average(array):
set1=set(arr)
sum1=sum(set1)
return sum1/len(set1)
if __name__ == '__main__':
n = int(input())
arr = list(map(int, input().split()))
result = average(arr)
print(result)
#include< stdio.h > int main() { int n,i,j,k; scanf( "%d" ,&n); for (i= 0 ;i<n;i++) { for (k=n- 1 ;k>i;k--) { printf( " " ); } for (j= 0 ;j<i+ 1 ;j++) { printf( "#" ); } printf( "\n" ); } return 0 ; }
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