#include <bits/stdc++.h>
using namespace std;
int main() {
double n;
cin>>n;
if(n<500){
n=n;
}
if(n>=500 and n<1000){
n=n-(n/100)*5;
}
if(n>=1000 and n<7000){
n=n-(n/100)*11;
}
if(n>=7000 and n<15000){
n=n-(n/100)*18;
}
if(n>=7000 and n<=15000){
n=n-(n/100)*18;
}
if(n>15000){
n=n-(n/100)*25;
}
cout<<n<<endl;
return 0;
}
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