#include<bits/stdc++.h>
#define int long long
using namespace std;
inline int re()
{
    int f=1,num=0;
    char c=getchar();
    while(c<'0'||c>'9'){if(c=='-') f=-1;c=getchar();}
    while(c>='0'&&c<='9') num=num*10+c-'0',c=getchar();
    return num*f;
}
const int MOD=1e9+7;
int a=1,m;
signed main()
{
    freopen("LCG.in","r",stdin);
    freopen("LCG.out","w",stdout);
    re();m=re();
    for(int i=2;i<m;i++) a=a*i%MOD;
    printf("%lld",a);
    return 0;
}