from itertools import accumulate
N, d, K = map(int, input().split())
limit = d*N
prevdp = [0] * (limit + 1)
prevdp[0] = 1
MOD = 10**9+7

for i in range(1, N + 1):
    dp = [0] * (limit + 1)
    #rui = list(accumulate(prevdp, initial=0))
    rui = [0]
    for j in range(limit + 1):
        rui.append((rui[-1] + prevdp[j])%MOD)

    for j in range(i, d*i + 1):
        dp[j] = (rui[j] - rui[max(0, j - d)])%MOD

    prevdp = dp

#print(dp)
ans = dp[K]
print(ans)