mod = 10 ** 9 + 7

n,d,k = map(int,input().split())

dp = [[0] * (d*n+1) for i in range(n+1) ]
dp[0][0] = 1

for i in range(n):
    for j in range(d*n,0,-1):
        dp[i+1][j] = sum(dp[i][max(0,j-d):j])

print(dp[n][k] % mod)