MOD = 10 ** 9 + 7
N,d,K = map(int,input().split())
dp = [0] * (K + 1)
dp[0] = 1
#print(0,dp)
for i in range(N):
    dp1 = dp[:]
    for j in range(1,K + 1):
        dp1[j] += dp1[j-1]
        dp1[j] %= MOD
    #print(1, dp1)
    dp2 = [0] * (K + 1)
    for j in range(i + 1,K + 1):
        dp2[j] = dp1[j - 1]
        if j > d:
            dp2[j] -= dp1[j - 1 - d]
            dp2[j] %= MOD
    dp = dp2
    #print(2,dp)
print(dp[K])