#include<cstdio>
#define N 32000
using namespace std;
int p[N],vis[N+10],T,i,j,l,n;
int main()
{
    scanf("%d",&T);
    for(i=2;i<=N;i++)
    {
        if(!vis[i])p[++l]=i;
        for(j=1;j<=l&&p[j]*i<=N;j++)
        {
            vis[p[j]*i]=1;
            if(i%p[j]==0)break;
        }
    }
    while(T--)
    {
        scanf("%d",&n);
        if(n==4){puts("2");continue;} 
        for(i=1;p[i]*p[i]<=n;i++)
            if(n%p[i]==0)break;
        if(p[i]*p[i]>n)printf("%d\n",n-1);
        else puts("0");
    }
}