#include<iostream> #include<cstdio> #include<cstring> using namespace std; int i , j; float yitiaoduanxing(int x) { float sum = 0.0; if(x%70 == 0){ sum+=1; } else{ sum += x/70+1; } return sum; } int main() { int n,x; float dianhuafeizonghe = 0; cin>>n; for(i = 0;i<n;i++) { cin >> x; dianhuafeizonghe += yitiaoduanxing(x); } printf("%.1f",dianhuafeizonghe/10); return 0; }