https://ac.nowcoder.com/acm/contest/9033/A
先算出选手的最终得分
如何排序
小A的总分大于等于第m名即可

#include<bits/stdc++.h>
using namespace std;
long long n,m,p;
double s[100005];
int main()
{
    cin>>n>>m>>p;
    for(int i=1;i<=n;i++){
        long long a,b;
        scanf("%lld%lld",&a,&b);
        s[i]=(a*0.85+b*0.15);
    }
    sort(s+1,s+n+1);
    cout<<int(max(ceil((s[n-m+1]-p*0.15)/0.85),0.0))<<"\n";
    return 0;
}