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

mod = 10**9 + 7
MAX = d*N

dp = [[0]*(MAX+1) for _ in range(N+1)]
dp[0][0] = 1

for i in range(N):
    for j in range(1, d+1):
        for k in range(MAX+1):
            if k+j <= d*N:
                dp[i+1][k+j] += dp[i][k]
                dp[i+1][k+j] %= mod

print(dp[N][K])