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|
  (0 .. N * d).each do |s|
    (1 .. d).each do |d_|
      dp[i][s] = (dp[i][s] + dp[i - 1][s - d_]) % MOD if s >= d_
    end
  end
end
puts dp[N][K]