help me please, here's my code, I don't know why it always gets WA 1

#include <stdio.h>
#include <stdlib.h>
int findmax(int a, int b) {return (a>b ? a : b);}

int mas[1001][1001];
int main(void)
{
    int i,j,a,b,k,max,min;
    for (i=1;i<1001;i++)
    {
        mas[1][i]=1;
        mas[2][i]=2;
        mas[i][1]=i;
    }
    for (i=3;i<1001;i++)
    {
        for (j=2;j<1001;j++)
        {
            mas[i][j]=2000;

            if (j>5)
                {
                    if (mas[i][j-1]==mas[i][j-2]) {mas[i][j]=mas[i][j-1]; continue;}
                }

            for (k=2; k<=i; k++)
            {
                max=findmax(mas[k-1][j-1],mas[i-k][j])+1;
                if (mas[i][j]!=2000 && max>mas[i][j]) break;
                if (max<mas[i][j]) {mas[i][j]=max; min=k;}
            }
        }
    }
    scanf("%d",&a);
    scanf("%d",&b);

    while (a!=0 && b!=0)
    {
        printf("%d\n",mas[b][a]);
        scanf("%d",&a);
        scanf("%d",&b);
        }
    return 0;
}