mod = 10 ** 9 + 7

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

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

for i in range(n):
    # for j in range(d*n,0,-1):
    s = [0] * (d*n+1)
    s[0] = dp[i][0]
    # print(s)
    for j in range(d-1):
        s[j+1] = s[j] + dp[i][j+1]
    # print(s,i)
    for j in range(d-1,w-1):
        tt1 = dp[i][j+1] 
        tt2 = dp[i][j+1-d]
        s[j+1] = s[j] + tt1 - tt2
    # print(s)
    for j in range(0,d*n):
        dp[i+1][j] = s[j-1]

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