mod = 10 ** 9 + 7
N, d, K = map(int, input().split())

dp = [[0] * (N + 1) for i in range(K + 1)]

dp[0][0] = 1

X = [0] * N

X[0] = 1

for i in range(1, K + 1):
    
    for j in range(N):
        
        dp[i][j + 1] += X[j]
        dp[i][j + 1] %= mod
        
    for j in range(N):
        
        X[j] += dp[i][j]
        
        if i >= d:
            X[j] -= dp[i - d][j]
        
        X[j] %= mod
        
print(dp[-1][-1])