N, D, K = map(int, input().split())
MOD = 10**9 + 7
dp = [[0]*(K+D+9) for _ in range(N+1)]
dp[0][0] = 1
for i in range(N):
    for j in range(K):
        dp[i+1][j+1] = (dp[i+1][j+1] + dp[i][j]) % MOD
        dp[i+1][j+D+1] = (dp[i+1][j+D+1] - dp[i][j]) % MOD
    for j in range(K+1):
        dp[i+1][j+1] = (dp[i+1][j+1] + dp[i+1][j]) % MOD

print(dp[N][K])