#include<fstream.h>
#include<math.h>

ifstream f("frac.in");
ofstream g("frac.out");

long div(long n)
{long i;
for(i=2;i<=sqrt(n);i++)
if(n%i==0) return i;
return n;
}
long div2(long n)
{long i;
for(i=div(n)+1;i<=n/2;i++)
if(n%i==0) return i;
return n;
}

int main()
{char q[50];
long n,d,d2;
long double p;
f>>n>>p;
f.close();
if(p==1)g<<1;
d=div(n);
d2=div2(n);
if(d2%d==0)g<<p+(p-d)+1;
      else if(p-2*(p/2)==0) g<<p+(p+1-d)+(p+1-d2)+1;
		  else g<<p+(p+1-d)+(p+1-d2)+2;


return 0;
}