/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
    Scanner sc=new Scanner(System.in);
    int n = Integer.parseInt(sc.nextLine());
    int t = (n % 1440);
    int z = (t % 60);
    int y = (n + t + z);
    System.out.println(t);
}
}

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