import java.io.*; import java.util.Scanner; public class Numbers { public static void main(String[] args) throws Exception { Scanner in = new Scanner(System.in); int a = in.nextInt(); int b = in.nextInt(); int c = in.nextInt(); int [] ulai = {a,b,c}; for (int i = 0; i < ulai.length; i++) { int res = ulai [i]; int res_i = i; int first = 1; for (int j = i+1; j < ulai.length; j++) { int res2 = ulai[j]; int second = 2; for (int k = j+1; k < ulai.length; k++) { int res3 = ulai[k]; int third = 3; if (res != res2 && res != res3 && res2 != res3) { return; } if (res != res2 && res != res3) { System.out.println(first); return; } if (res2 != res && res2 != res3) { System.out.println(second); return; } if (res3 != res && res3 != res2) { System.out.println(third); return; } else { return; } } } } } }