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

dp = [[0] * (N * d + 2) for _ in range(N)]
for i in range(1,d+1):
    dp[0][i] = 1
P = 10 ** 9 + 7
for i in range(N-1):
    for j in range(N * d + 1):
        if dp[i][j]:
            dp[i+1][j+1] = (dp[i+1][j+1] +  dp[i][j]) % P
            dp[i+1][j+d+1] =(dp[i+1][j+d+1] - dp[i][j]) % P
    for j in range(1,N * d + 2):
        dp[i+1][j] = (dp[i+1][j] + dp[i+1][j-1]) % P
print(dp[-1][K])