#include <iostream> #include <cmath> #include <iomanip> using namespace std; double fee(int n){ if(n%70==0) return n/70*0.1; else return (n/70+1)*0.1; } int main(){ int n,m; double sum=0; cin>>n; for(int i=1;i<=n;i++){ cin>>m; sum+=fee(m); } cout<<fixed<<setprecision(1)<<sum; return 0; }