#include <stdio.h>
int main() {
    int a,b,c;
    scanf("%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;
        }
        
        print("%d",max);
    }
    return 0;
}