#include<bits/stdc++.h>
using namespace std;
int main(){
	int y,m;
	cin>>y>>m;
	switch(m){
		case 1:cout<<"31";break;
		case 2:
			if((y%4==0&&y%100!=0) || (y%400==0)) cout<<"29";
			else cout<<"28";
			break;
		case 3:cout<<"31";break;
		case 4:cout<<"30";break;
		case 5:cout<<"31";break;
		case 6:cout<<"30";break;
		case 7:cout<<"31";break;
		case 8:cout<<"31";break;
		case 9:cout<<"30";break;
		case 10:cout<<"31";break;
		case 11:cout<<"30";break;
		case 12:cout<<"31";break;
		
	}
	return 0;
}

include<bits/stdc++.h>

using namespace std; int main(){

int n;
double ans;
cin>>n;
if(n<=100) ans=n;
else if(n<=200) ans=n*0.9;
else ans=n*0.8;
printf("%.1lf",ans);
return 0;

}