1063

#include<iostream> #include<stdio.h>#include<string.h>#include<cmath>#include<algorithm>using namespace std;#define N 100int main(){    int n;    scanf("%d",&n);    double ans=0;    for(int i=1;i<=n;i++)    {        int a,b;        scanf("%d%d",&a,&b);        ans=max(ans,sqrt(a*a+b*b));    }    printf("%0.2lf\n",ans);    return 0;}