#include <iostream> #include <cstdio> using namespace std; int a(int e){ int t=0; if(e%70==0) return e/70; else return e/70+1; } int main() { int m,n; double q=0; cin>>n; for (int i=1;i<=n;i++){ cin>>m; q=q+a(m); } printf("%.1lf",q*0.1); return 0; }