# include<iostream> # include<stdio.h> using namespace std; int a(int n){ int b=0; while(n>0){ b++; n-=70; } return b; } int main(){ int n,m[1501],x=0; double y; cin>>n; for(int i=1;i<=n;i++){ cin>>m[i]; x+=a(m[i]); } printf("%.1f",x*0.1); return 0; }