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22 lines
494 B
C++
22 lines
494 B
C++
#include <cstdio>
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#include <cstring>
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using namespace std;
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bool notPrime[3001];
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int main()
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{
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memset(notPrime,0,sizeof(notPrime));
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for(int i=2; i<3000; i++)
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if(!notPrime[i])
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for(int j=i*i; j<3000; j+=i)
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notPrime[j]=true;
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int x,y;
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while(scanf("%d%d",&x,&y),x|y)
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{
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bool flag=true;
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for(int i=x; i<=y&&flag; i++)
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flag&=!notPrime[i*i+i+41];
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puts(flag?"OK":"Sorry");
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}
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return 0;
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}
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