#include<bits/stdc++.h> using namespace std; double a(int y){ double m=0; if(y%70!=0){ m=y/70*0.1+0.1; }else{ m=y/70*0.1; } return m; } int main() { int n; cin>>n; int e[10000]; for(int i=0;i<=n-1;i++){ cin>>e[i]; } double sum; for(int i=0;i<=n-1;i++){ sum=sum+a(e[i]); } printf("%.1lf",sum); return 0; }