#include<bits/stdc++.h> using namespace std; int main() { int a[1505]; int n; double s=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; if(a[i]<=70){ s+=0.1; } else if(a[i]%70==0){ s+=(a[i]/70)*0.1; } else{ s+=(a[i]/70)*0.1+0.1; } } printf("%.1lf",s); return 0; }