49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
#include<cstdio>
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#include<cmath>
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bool prime[10001];
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void IsPrime(){
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prime[0]=prime[1]=0;prime[2]=1;
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for(int i=3;i<=10000;i++)
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prime[i]=i%2==0?0:1;
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int t=(int)sqrt(10000*1.0);
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for(int i=3;i<=t;i++)
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if(prime[i])
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for(int j=i*i;j<10000;j+=2*i)
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prime[j]=0;
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}
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int main()
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{
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IsPrime();
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int pri[10010];
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int num = 0;
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for(int i = 0; i < 10000; i++)
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{
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if(prime[i])
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pri[num++] = i;
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}
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int m, a, b;
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while(scanf("%d%d%d", &m, &a, &b)!=EOF && m && a && b)
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{
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int maxx = 0, ii, jj;
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for(int i = num-1; i >= 0; i--)
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{
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for(int j = i; j <= num-1; j++)
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{
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if(pri[j] > m || pri[i]*pri[j]>m || 1.0*pri[i]/pri[j]<1.0*a/b)
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continue;
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else
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{
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if(maxx < pri[i]*pri[j])
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{
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maxx = pri[i]*pri[j];
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ii = pri[i];
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jj = pri[j];
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}
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}
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}
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}
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printf("%d %d\n", ii, jj);
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}
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return 0;
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}
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