// editor3
#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");
    }
    else{
        int max = score[0];
        for (int i = 1; i < 3; i++){
            if (score[i] > max)
                max = score[i];
        }
        printf("%d",max);
    }
    return 0;
}