杭电2012

#include<stdio.h>
#include<math.h>
int main()
{
    int n,m,i,j,t,x,y;
    while(~scanf("%d%d",&x,&y)&&(x||y))
    {
        for(i=x,t=1; i<=y; ++i)
        {
            x=i*i+i+41;
            n=(int)sqrt((double)x);
            for(j=2; j<=n; ++j)
            {
                if(!(x%j))
                    break;
            }
            if(j<=n)
                t=0;
        }
        if(t)
            printf("OK
");
        else
            printf("Sorry
");
    }
    return 0;
}