#include<stdio.h>
int main()
{
    int Alex,Jordan,Taylor;
    scanf("%d%d%d",&Alex,&Jordan,&Taylor)
    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;
}