Program_to_find_the_maximum_number_of_handshakes_.java

import java.util.Scanner;
class Solution 
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int b;
        b=n*(n-1)/2;
        System.out.println(b);
    }
}