#include <stdio.h>
int main() {
    int a, b, c;
    sacnf("%d %d %d",&a, &b, &c);
    if (a == b && b== c){
    printf("Invalid Input");
    }
    else {
        int max = a;
        if (b > max){
            max = b;
        }
        if (c > max){
            max = c;
        }
        printf("%d",max);
    }
    return 0;
}