#include<iostream> #include<cstdio> #include<cstring> #include<cmath> using namespace std; int a[1501]; int main(){ int n,sum=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; if(a[i]%70 !=0){ sum+=a[i]/70+1; } else{ sum+=a[i]/70; } } printf("%.1lf",sum*0.1); }