#include <stdio.h>
int main(){
    int score[3];
    for(int i=0;i<3;i++){
        scanf("%d",&score[i]);
    }
        if(score[0] == score[1] && score[1] == score[2]){
            
            
            printf("Invalid input\n");
            return 0;
        }
        else{
            int max = score[0];
            for(int i=1;i<3;i++){
                if(score[i]>max)
                max=score[i];
            }
            printf("%d",max);
        }
        return 0;
    }
}