# coding: utf-8
# Your code here!
N,d,K=map(int,input().split())

dp=[[0]*(K+1) for i in range(N+1)]
dp[0][0]=1

for i in range(N):
    for j in range(K+1):
        for p in range(d):
            if j-p-1>=0:
                dp[i+1][j]+=dp[i][j-p-1]

print(dp[-1][-1]%(10**9+7))
#print(dp)