void init(){    int i;    pp[0] = 1;    for(i = 1; i <= N-10 ; i++)    {        pp[i] = (pp[i-1]*i)%mod;    }}LL fastmod(LL a,LL k){    LL b = 1;    while(k)    {        if(k&1)        b = a*b%mod;        a = (a%mod)*(a%mod)%mod;        k/=2;    }    return b;}LL calc(int n,int m){    return (pp[n]*fastmod((pp[m]*pp[n-m])%mod,mod-2))%mod)%mod;}