This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<cstdio>
#include<algorithm>
double all,m,p[22],d[22],D[1<<20];
int a,i,j;
main()
{
	scanf("%d",&a);
	for(i=0;i<a;i++)scanf("%lf%lf",&p[i],&d[i]),p[i]/=100;
	for(i=1;i<(1<<a);i++)
	{
		all=0;
		for(j=0;j<a;j++)
		{
			if((i>>j)%2)
			{
				D[i]+=p[j]*d[j]+(1-p[j])*D[i-(1<<j)];
				all++;
			}
		}
		D[i]/=all;
		m=std::max(m,D[i]);
	}
	printf("%.12lf",m);
} 
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