#include <iostream>
using namespace std;
int main() {
int n,a,b,c;
cin>>n;
a=n/100*100;
if(n%100<65){
b=((n%100)-(n%20))*1.5;
}
else{
b=100;
}
if(n%20<15){
c=n%20*2;
}
else{
c=30;
}
cout<<a+b+c;
}
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