from itertools import accumulate
n,d,k = map(int,input().split())
mod = 10**9+7
dp = [0 for i in range(k+1)]
dp[0] = 1
acc = [0]*(k+1)
for i in range(1,n+1):
  acc[0] = dp[0]
  for j in range(1,k+1):
    acc[j] = (acc[j-1]+dp[j])%mod
  dp[0] = 0
  for j in range(1,k+1):
    if j <= d:
      dp[j] = acc[j-1]
    else:
      dp[j] = (acc[j-1]-acc[j-d-1])%mod
print(dp[-1])