MOD = 10 ** 9 + 7

if __name__ == "__main__":
    n, d, k = map(int, input().split())
	
    dp = [0 for i in range(k + 1)]
    dp[0] = 1
    to = [0 for i in range(k+1)]
    for _ in range(n):
        s = 0
        for i in range(min(d*(_+1)+1,k)):
            s = (s + dp[i]) % MOD
            if i >= d:
                s = (s + MOD - dp[i - d]) % MOD
            to[i+1] = s
        dp = to.copy()
    print(dp[k])