def main():
    import sys
    input = sys.stdin.readline

    N, d, K = map(int, input().split())
    mod = 1000000007

    dp = [[0] * (K+1) for _ in range(N+1)]
    dp[0][0] = 1
    for i in range(1, N+1):
        cs = [0] * (K+2)
        cs[1] = dp[i-1][0]
        for j in range(1, K+1):
            cs[j+1] = (cs[j] + dp[i-1][j])%mod
        for j in range(K+1):
            dp[i][j] = (cs[max(0, j)] - cs[max(0, j-d)])%mod
    print(dp[-1][-1])


if __name__ == '__main__':
    main()