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