#include<stio.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;
}