>>169
#include <stdio.h>
#include <stdlib.h>
int route(int m, int n)
{
if (m == 1 || n == 1) return 1;
else return route(m - 1, n) + route(m, n - 1);
}

int main(int argc, char *argv[])
{
if (argc != 3)
return 1;
int m = atoi(argv[1]), n = atoi(argv[2]);
printf("%d", route(m, n));
return 0;
}