#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 if{
        if(a>=b && a>= c){
            printf("%d",b);
        }
        else{
            printf("%d",c);
        }
    }
}