n, s, k = map(int, input().split())
dp = [0]*(s+1)
for i in range(0, s+1, n):
  dp[i] = 1
mod = 10**9+7
for i in range(1, n):
  dp_ = [0]*(s+1)
  sum_ = 0
  sum_ = [0]*i
  for j in range(s+1):
    if j-k*i>=0:
      sum_[j%i] += dp[j-k*i]
      sum_[j%i] %= mod
    dp_[j] = sum_[j%i]
  dp = dp_

print(dp[-1]%mod)