# coding: utf-8
# Your code here!
N,d,K=map(int,input().split())

dp=[0]*(K+1)
dp[0]=1

for i in range(N):
    temp=[0]*(K+1)
    for j in range(K+1):
        temp[j]=sum(dp[max(j-d,0):j])
    dp=temp[:]
print(dp[-1]%(10**9+7))