#include<iostream>
#include<fstream>
#include<conio.h>
#include <cmath>
using namespace std;
int n;  // numarul spectacolelor !
float O[100][3];
float compute(float start, int duration)
{
    float ora_h = 0;
    ora_h = floor(start);
    float minutesLeft = start - ora_h;
    minutesLeft *= 100;
    minutesLeft += duration;
    int plus_h;
    plus_h= floor(minutesLeft / 60);
    minutesLeft=minutesLeft-plus_h*60;
    ora_h=ora_h+plus_h;
    minutesLeft = int(ceil(minutesLeft)) % 60;
    minutesLeft /= 100;
    ora_h += minutesLeft;
    return ora_h; }

int read_data()
{
fstream f;
f.open("input.dat",ios::in);
f>>n;
for(int i=1;i<=n;i++)
    {
    f>>O[i][1]; // ora de inceput
    f>>O[i][2];  // durata
    O[i][3]=compute(O[i][1],O[i][2]);  // ora de sfarsit
    }
}

int sort_data()
{
    int aux,schimb,i;
	do
	{
		schimb=0;
		for (i=1;i<n;i++)
			if (O[i][3]>O[i+1][3])
			{
				swap(O[i][3],O[i+1][3]);
				swap(O[i][1],O[i+1][1]);
				swap(O[i][2],O[i+1][2]);

				schimb=1;
			}
	}
	while (schimb);

}

int print_data()
{
/*
input.dat

4
8.10 40
7.00 20
11.30 30
10.45 45

de afisat
7.00 20
8.10 40
10.45 45
11.30 30
*/

for(int i=1;i<=n;i++)
    cout<<O[i][1]<<" "<<O[i][2]<<endl;

}

int main()
{
read_data();
sort_data();
print_data();
}