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#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int main()
{
int n,p,q,nr=0,qq,pp,ok;
fin>>n;
for(p=1; p<=n; p++) {
for(q=1; q<=n; q++) {
ok=0;
if(q%p==0) {
qq=q;
pp=p;
while(pp!=qq) {
if(qq>pp) {
qq=qq-pp;
}
if(qq<pp) {
pp=pp-qq;
}
}
if(qq==1) {
nr++;
cout<<p<<"/"<<q<<" ";
}
ok=1;
}
if(p%q!=0 && ok==0|| q==1 && ok==0) {
nr++;
cout<<p<<"/"<<q<<" ";
}
}
}
}