MOD = 10 ** 9 + 7

n, d, k = map(int, input().split())
dp = [0 for _ in range(k + 1)]
dp[0] = 1
for _ in range(n):
  ndp = [0 for _ in range(k + 1)]
  s = [0 for _ in range(k + 1)]
  for i in range(k + 1):
    s[i] = (s[i - 1] + dp[i]) % MOD
  for i in range(1, k + 1):
    if i - d - 1 >= 0:
      ndp[i] = (s[i - 1] - s[i - d - 1]) % MOD
    else:
      ndp[i] = s[i - 1]
  dp = ndp

print(dp[k])