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

print(dp[K][N])