#include<iostream> using namespace std; double fee(int m){ double money=0; while(m>0){ m=m-70; money+=0.1; } return money; } int main(){ int n,num; double t=0; cin>>n; for(int i=1;i<=n;i++){ cin>>num; t+=fee(num); } printf("%.1lf\n",t); return 0; }