import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    N,d,K=MI()
    dp=[0]*(1+K)
    dp[0]=1
    
    for i in range(N):
        S=[0]*(K+1)
        for j in range(K):
            S[j+1]=(S[j]+dp[j])%mod
            
        for j in range(K,-1,-1):
            dp[j]=(S[j]-S[max(0,j-d)])%mod
            
    print(dp[-1])
        


main()