Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh: mm. However, he hates waking up, so he wants to make waking up less painful by setting the alarm at a lucky time. He will then press the snooze button every x minutes until hh: mm is reached, and only then he will wake up. He wants to know what is the smallest number of times he needs to press the snooze button.

A time is considered lucky if it contains a digit '7'. For example, 13: 07 and 17: 27 are lucky, while 00: 48 and 21: 34 are not lucky.

Note that it is not necessary that the time set for the alarm and the wake-up time are on the same day. It is guaranteed that there is a lucky time Jamie can set so that he can wake at hh: mm.

Formally, find the smallest possible non-negative integer y such that the time representation of the time x·y minutes before hh: mm contains the digit '7'.

Jamie uses 24-hours clock, so after 23: 59 comes 00: 00.

Input

The first line contains a single integer x (1 ≤ x ≤ 60).

The second line contains two two-digit integers, hh and mm (00 ≤ hh ≤ 23, 00 ≤ mm ≤ 59).

Output

Print the minimum number of times he needs to press the button.

Examples

Input

3
11 23


Output

2


Input

5
01 07


Output

0

Note

In the first sample, Jamie needs to wake up at 11:23. So, he can set his alarm at 11:17. He would press the snooze button when the alarm rings at 11:17 and at 11:20.

In the second sample, Jamie can set his alarm at exactly at 01:07 which is lucky.
x = readline();
time = readline().split(' ').map(Number);

var luckyTime = false, count = 0;

while (luckyTime == false) {
	var timeCheck = time.join('').split('').map(Number);

	for (var i = 0; i < timeCheck.length; i++) {
		if (timeCheck[i] == 7) {
			luckyTime = true;
		};
	};  
    
    if (time[1] - x < 0) {
    	var temp = Math.abs(time[1] - x); 
    		
    	time[1] = 60 - temp;

    	if (time[0] == 0) {
    		time[0] = 23;
    	} else {
    		time[0] = time[0] - 1;
    	};
    } else {
    	time[1] = time[1] - x;
    };
    
    if (luckyTime == false) {
        count++;
    };
};

print(count);