n,d,k=map(int,input().split())
dp=[0]*(k+1)
dp[0]=1;mod=10**9+7;dp[1]=-1
for i in range(n):
    dp2=[0]*(k+1)
    for j in range(k):
        dp[j+1]+=dp[j];dp[j+1]%=mod
        dp2[j+1]+=dp[j];dp2[j+1]%=mod
        if j+d+1<=k:
            dp2[j+d+1]-=dp[j];dp2[j+d+1]%=mod
    dp=dp2
for i in range(k):
    dp[i+1]+=dp[i]
print(dp[k]%mod)