#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    if(n<=1)
    {
        printf("Invalid input\n");
        return 0;
        
    }
    int ids[n],dup[100],,dcount=0;
    for (int i=0;i<n;i++){
    for(int j=i+1;j<n;j++){
        if(ids[i]==ids[j]){
            int already =0;
            for (int k=0;k<dcount;k++) {
                if(dup[k]==ids[i]){
                    already=1;
                    break;
                }
            }
        }
    }
}