MOD = 10**9 + 7
N, d, K = map(int,input().split())

dp = [0]*(max(d+1,K+1))
for k in range(1,d+1):
    dp[k] = 1

for i in range(N-1):
    s = [0]*(max(d+1,K+1))
    for j in range(1,K+1):
        s[j] = s[j-1] + dp[j]
        s[j] %= MOD
#    print(s)
    new = [0]*(max(d+1,K+1))
    for j in range(i+1,K+1):
        new[j] = s[j-1] - s[max(0,j-d-1)]
        new[j] %= MOD
    dp = new[::]
print(dp[K])