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 d[1111111];
double p[22],q[22];
int main()
{
    double max=0;
    int i,j,t,n;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        scanf("%lf%lf",&p[i],&q[i]);
        p[i]/=100;
    }
    for(i=1;i<(1<<n);i++)
    {
        t=0;
        for(j=0;j<n;j++)if((i>>j)&1)
        {
            t++;
            d[i]+=p[j]*q[j]+(1-p[j])*d[i^(1<<j)];
        }
        d[i]/=t;
        max=std::max(max,d[i]);
    }
    printf("%.12lf\n",max);
}
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