#include <iostream>
using namespace std;
int ar[10001],m,n,x,Sum,Min;
int main()
{
cin>>m>>n;
for(int y=2; y<10001; y++)ar[y]=y;
for(int y=2; y<10001; y++)
{
if(ar[y]==y)
{
for(int z=y+y; z<10001; z+=y)ar[z]=0;
}
}
for(int y=n; y>=m; y--)
{
if(ar[y]==y) Sum+=y,Min=y;
}
if(Sum>0)cout<<Sum<<endl<<Min;
else cout<<-1;
}