def max(a,b); a > b ? a : b; end
  
MOD = 10 ** 9 + 7
N,d,K = gets.split.map(&:to_i)
dp = Array.new(N + 1){Array.new(N * d + 1, 0)}
dp[0][0] = 1
(1 .. N).each do |i|
  (1 .. K).each do |s|
    dp[i - 1][s] = (dp[i - 1][s] + dp[i - 1][s - 1]) % MOD
    if s > d
      dp[i][s] = (dp[i - 1][s - 1] - dp[i - 1][s - d - 1]) % MOD
    else
      dp[i][s] = dp[i - 1][s - 1] % MOD
    end
  end
end
puts dp[N][K]