#include <iostream>
using namespace std;

int main() {
	// your code goes here
int N;
cin>>N;
if(N<=10){
cout<<N*6;
}
else if(11<=N && N<=20){
cout<<(10*6)+(N-10)*2;
}
else if(21<=N && N<=39){
cout<<(10*6)+(10*2)+(N-20)*1;
}
else if(N>=40){
cout<<"100";
}

	return 0;
}