import sys
def MI(): return map(int, sys.stdin.readline().split())

def main():
    md=10**9+7
    n,d,k=MI()
    dp=[0]*(k+1)
    dp[0]=1
    for _ in range(n):
        s=0
        ndp = [0] * (k + 1)
        for i in range(1,k+1):
            s+=dp[i-1]
            if i-1-d>=0:s-=dp[i-1-d]
            s%=md
            ndp[i]=s
        dp=ndp
    print(dp[k])

main()