#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
	int a;
	cin>>a;
	if(a>=25)
	{
		cout<<60-a+25;
	}
	else if(a<25)
	{
		cout<<25-a;
	}
	return 0;
}	

#include<iostream>
using namespace std;
int main()
{
	int m;
	cin>>m;
	if(m<25)
    {
		cout<<25-m;
	}
	else
    {
		cout<<85-m;
	}
	return 0;
}