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Cod sursa(job #691024)
#include<iostream>
#include<fstream>
int main(){
using namespace std;
fstream fin("fractii.in" ,ios::in) , fout("fractii.out" ,ios::out);
long n,i,j,k,c=0,contor=0;
fin>>n;
for(i=1;i<=n;i++){
for(j=1;j<=n;j++){
for(k=2;k<=n;k++){
if((i%k==0)&&(j%k==0)){c++;}}
if(c==0){contor++;}c=0;}}
fout<<contor;
return 0;
}