#include <iostream>
#include <sstream>
using namespace std;
int main() {
//freopen("TIEN.INP","r",stdin);
//freopen("TIEN.OUT","w",stdout);
long long n;
cin >> n;
int t=0;
if (n<=200) {
t+=n*6500;
} else {
t+=6500*200+(n-200)*6000;
}
cout << t;
}
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