#include<bits/stdc++.h>
using namespace std;
int main()
{
int n; int i,a[3001],d[3001],j,b;
while(scanf("%d",&n
)==1){ b=1;
for(i=0;i<n;i++)
{
}
for(i=0;i<n-1;i++)
{
// printf("%d\n",d[i]);
}
sort(d,d+n-1);
for(j =0;j<n-1;j++)
{
// printf("%d ",d[j]);
if(d[j]==d[j+1]){
b=0;
break;
}
}
if(b==0)
else
}
return 0;
}
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