#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)
        }
        printf("%d",max);
        return 0;
}