N, d, K = map(int, input().split())
mod = int(1e9)+7
def inved(a):
    x, y, u, v, k, l = 1, 0, 0, 1, a, mod
    while l != 0:
        x, y, u, v = u, v, x - u * (k // l), y - v * (k // l)
        k, l = l, k % l
    return x % mod
    
fact = [1 for _ in range(N+K+1)]
invf = [1 for _ in range(N+K+1)]
for i in range(N+K):
    fact[i+1] = (fact[i]*(i+1))%mod
invf[-1] = inved(fact[-1])
for i in range(N+K, 0, -1):
    invf[i-1] = (invf[i] * i) % mod
    
S = 0
sign = 1
for i in range(N+1):
    if K-i*d-N < 0:
        break
    else:
        S += (sign * fact[K-1-i*d] * invf[i] * invf[N-i] * invf[K-i*d-N]) % mod
        S %= mod
        sign *= mod - 1
        sign %= mod
print((N*S)%mod)