N,D,K=map(int,input().split())
now=N*D+1


dp=[[0]*(N*D+1) for _ in range(N+1)]
d=10**9+7
dp[0][0]=1
for i in range(N):
  for j in range(i,K-(N-i-1)):
    if dp[i][j]:
      for next in range(1,D+1):
        if next>K:
          continue
        dp[i+1][next+j]+=dp[i][j]
        dp[i+1][next+j]%=d
print(dp[-1][K])