#include<iostream> #include<cstdio> #include<cstring> using namespace std; float n,s,x; int dx(int a){ if (a%70==0) return a/70; if (a%70!=0) return a/70+1; } int main(){ cin>>n; for (int i=1;i<=n;i++){ cin>>x; s+=dx(x); } printf("%.1f",s/10.0); return 0; }