Cod sursa(job #62653)
Utilizator | MciprianM MciprianM | Data | 23 mai 2007 18:18:02 |
---|---|---|---|
Problema | Fractii | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include<fstream>
using namespace std;
unsigned long cmmdc(unsigned long m,unsigned long n){
if(n%2==0)
if(m%2==0)
return 0;
if(!n) return m;
else return cmmdc(n,m%n);
}
int main(){
unsigned long n,i,j,count=0;
ifstream f("fractii.in");
f>>n;
f.close();
for(i=3;i<=n;i++)
for(j=i+1;j<=n;j++)
if(cmmdc(i,j)==1) count+=2;
count=count+n+(n/2)+n%2;
ofstream g("fractii.out");
g<<count<<'\n';
g.close();
return 0;
}