#include
#include
int main()
{
int a,b,i,k,x;
do
{
scanf("please input two numbers,the later one is smaller:");
}while(a>=b);
k=(int)sqrt(x);
for(x=a+1;x++;x {
for(i=2;i {
if(x%i==0)
{
break;
}
}
if(i>k)
{
printf("%d",x);
}
}
return 0;
}