from copy import *
mod=10**9+7
N,D,K=map(int,input().split())
dp=[copy([1])]
for i in range(1,N+1):
    dp.append(copy([0]*(i+(i*D))))
    for j in range(1,D+1):
        for k in range(0,((i-1)*D)+1):
            dp[i][k+j]=(dp[i][k+j]+dp[i-1][k])%mod
print(dp[N][K])