n,d,k=map(int,input().split())
mod=10**9+7
dp=[[0]*(n*d+1) for _ in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    tmp=0
    for j in range(n*d+1):
        if j==0:
            continue
        tmp+=dp[i-1][j-1]
        if j-d-1>=0:
            tmp-=dp[i-1][j-d-1]
        tmp%=mod
        dp[i][j]=tmp
print(dp[-1][k])