#yuki1011
mod=10**9+7
n,d,k=map(int,input().split())
dp=[0]*(k+1)
dp[0]=1
for j in range(n):
 t=0
 for i in dp[max(0,k-d):k]:
  t+=i
  t%=mod
 for i in range(k,-1,-1):
  dp[i]=t
  t-=dp[i-1]
  if i-1-d>=0:
   t+=dp[i-1-d]
  t%=mod
print(dp[-1])