?
package fr.codegym.task.task04.task0424;
/*
Trois nombres
*/
import java.io.*;
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);
int a = input.nextInt();
int b = input.nextInt();
int c = input.nextInt();
if((a!=b)&&(a!=c))
System.out.println("1");
else if ((b!=a)&&(b!=c))
System.out.println("2");
else if ((c!=a)&&(c!=b))
System.out.println("3");
else if ((a!=b)&&(a!=c)&&(b!=c))
System.out.println();
}
}