/*
#include<stdio.h>
memo[31]={0};
int abc(int a, int b)
{
if(b == 0 || b==a)
{
return 1;
}
return abc(a-1,b-1) + abc(a-1,b);
}
int main()
{
int a,b;
scanf("%d %d", &a, &b);
printf("%d", abc(a,b));
return 0;
}
//abc(a,b)
//4 1 + 3 1
//3 0
//8 6
//40,320%1440=28
//7 5 + 6 5 + 5
*/
#include <stdio.h>
int memo[99]={};
int abc(int a, int b)
{
if()
{
}
}
int main()
{
int a,b;
scanf("%d %d", &a, &b);
prinf("%d", abc(a,b));
}