from copy import *
mod=1000000007
N,D,K=map(int,input().split())
dp=list()
dp.append(copy([0]*(K+1)))
dp[0][0]=1
for i in range(N):
    dp.append(copy([0]*(K+1)))
    for j in range(1,D+1):
        for k in range(K):
            if k+j<=K:
                dp[i+1][k+j]=(dp[i+1][k+j]+dp[i][k])%mod
print(dp[N][K]%mod)