N,d,K=map(int,input().split())
M=10**9+7
q=[0]*(K+1)
q[0]=1
for _ in range(N):
  nq=[0]*(K+1)
  for i in range(K):
    nq[i+1]+=q[i]
    if i+d+1<=K:
      nq[i+d+1]-=q[i]
  for i in range(1,K+1):
    nq[i]+=nq[i-1]
    nq[i]%=M
  q=nq
print(q[K]%M)