int n,i,c=1;

printf("Unesite broj:");
scanf("%d",&n);

for (i=2;i<=n;++i)
{
  if (i%i==0 && i%2!=0)
  c=c+1;
  else continue;

}
printf("Od broja 1 do broja %d ima %d prosta broja.\n",n,c);
return(0);
}