#include<bits/stdc++.h>
#define int long long
#define double long double
using namespace std;

const int N=2e5+5;

struct qw{
	int a,b,c;
}x[N];

int n;
double l=0,r=2147483647,mid=0;

inline int read();
inline bool check(double);

signed main()
{
	n=read();
	for(int i=1;i<=n;i++) {x[i].a=read(); x[i].b=read(); x[i].c=read();}
	while(r-l>0.00001)
	{
		mid=(l+r)/2.0;
		if(check(mid))
		r=mid;
		else
		l=mid;
	}
	printf("%0.2Lf",r);
	return false;
}

inline bool check(double m)
{
	double time=0.0;
	for(int i=1;i<=n;i++)
	{
		time+=x[i].c/m;
		if(time>x[i].b)
		return 0;
		if(time<x[i].a)
		time=x[i].a;
	}
	return 1;
}

inline int read()
{
	int q=1,x=0;char ch=getchar();
	while(ch<'0' or ch>'9') {if(ch=='-') q=-1; ch=getchar();}
	while(ch>='0' and ch<='9') {x=x*10+ch-'0';ch=getchar();}
	return q*x;
}