杭电 hdu 2012

素数判定：

#include<iostream>
#include<cmath>
using namespace std;
int judge(int n){
    int t=0;
    int i;
    for(i=2;i<sqrt(n);++i){
        if(n%i==0){
            t=1;
            break;
        }
    }
    if(t==0)
        return 1;
    else
        return 0;
}
int main(){
    int x,y;
    while(cin>>x>>y){
        if(x==0&&y==0)
            break;
        int i;
        int t=0;
        for(i=x;i<=y;++i){
            if(judge(i*i+i+41)==0){
                t=1;
                break;
            }
        }
        if(t==0)
            cout<<"OK"<<endl;
        else
            cout<<"Sorry"<<endl;
    }
    return 0;
}