l=list(map(int,input().split()))
def fac(x):
    if x==0:
        return 1
    if x==1:
        return 1
    else:
        return x*fac(x-1)
a=fac(l[1])
b=fac(l[2])
c=fac(l[1]-l[2])
print((a//(b*c))%(10**9+7))