#include <stdlib.h>
#include <stdio.h>

int a[100][100];

#define INT_MAX 1000;

n = 20;

int valid(int i, int j, int k)
{
    int x,check = 1;

    //verifica linia
    for (x = 1; x <= n; x++){
        if (a[i][x] == k)
            check = 0;
        if (a[x][j] == k)
            check = 0;
    }

    if (check == 0)
        return 0;
    else
    {
        a[i][j] = k;
        return 1;
    }
}

int main()
{
    int i,j,x,y,p,k = 0;

    a[1][1] = 0;

    for (i = 0; i <= n; i++)
        for (j = 0; j<=n; j++)
            a[i][j] = INT_MAX;

    for (i = 1; i <= n; i++) { k =0;
        for (j = 1; j <= n; j++)
        {
            if (i == 1 && j == 1)
                a[i][j] = 0;
            else {
            k = 0;

            p = valid(i,j,k);
            while (p != 1){
                k++;
                p = valid(i,j,k);
            }
            }
        } }

    FILE *in;

    in = fopen("tabela.in","r");

    fscanf(in,"%d %d",&x,&y);

    fclose(in);

    in = fopen("tabela.out","w");

    fprintf(in,"%d",a[x][y]);

    fclose(in);

    return 0;
}