30 lines
526 B
C++
30 lines
526 B
C++
#include<iostream>
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#include<cstdio>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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int a[10002];
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double b[10002];
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double p[10002];
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int n,m;
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void dp()
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{
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memset(p,0,sizeof(p));
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for(int i=1;i<=m;++i)
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{
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for(int j=n;j>=a[i];--j)
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p[j]=max(p[j],1-(1-p[j-a[i]])*(1-b[i]));
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}
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}
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int main()
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{
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while(cin>>n>>m&&(m+n))
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{
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for(int i=1;i<=m;++i)
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cin>>a[i]>>b[i];
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dp();
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printf("%.1f%%\n",p[n]*100);
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}
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return 0;
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}
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