Cod sursa(job #744438)
Utilizator | Denis Mita Kira96 | Data | 8 mai 2012 18:16:49 |
---|---|---|---|
Problema | Fractii | Scor | 30 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.42 kb |
#include<stdio.h>
int v[1000010],i,j,sol,n;
int main()
{
freopen("fractii.in","r",stdin);
freopen("fractii.out","w",stdout);
scanf("%d",&n);
sol=1;
for (i=1;i<=n;++i)
{
v[i]=i;
}
for(i=2;i<=n;++i)
{
if (v[i]==i)
{
for (j=i;j<=n;j+=i)
{
v[j]=v[j]/i*(i-1);
}
}
sol+=2*v[i];
}
printf("%d",sol);
return 0;
}