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