#include <iostream>
#include <stdio.h>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <algorithm>
using namespace std;
int main(void)
{
    int ulaz1,ulaz2;
    int niz1[ulaz1],niz2[ulaz2];
    scanf("%d %d", &ulaz1, &ulaz2);
    for (int i=0;i<ulaz1;++i){
        scanf ("%d", &niz1[i]);
    }
    for (int i=0;i<ulaz2;++i){
        scanf ("%d", &niz2[i]);
    }
    printf("9");
    return 0;
}