N, d, K = map(int, input().split())
dp = [[0]*(K+1) for _ in range(N+1)]
dp[0][0] = 1
MOD = 10**9+7

for i in range(N):
    acc = [0]
    
    for j in range(K+1):
        acc.append((acc[-1]+dp[i][j])%MOD)
        
    for j in range(K+1):
        dp[i+1][j] = (acc[j]-acc[max(0, j-d)])%MOD

print(dp[N][K])