tijie

#include<bits/stdc++.h>
using namespace std;
int main(){
int a;
cin>>a;
double f=0.0;
int b[a+1];
for(int i=1;i<=a;i++){
cin>>b[i];
if(b[i]>70){
if(b[i]%70==0){
f+=b[i]/70*1;
}
else f+=b[i]/70+1;
}
else f+=1;
}
cout<<f/10;
return 0;
}