Problem:
Score : 500 points

Problem Statement

Ibis is fighting with a monster.

The health of the monster is H.

Ibis can cast N kinds of spells. Casting the i-th spell decreases the monster's health by A_i, at the cost of B_i Magic Points.

The same spell can be cast multiple times. There is no way other than spells to decrease the monster's health.

Ibis wins when the health of the monster becomes 0 or below.

Find the minimum total Magic Points that have to be consumed before winning.

Constraints

1 \leq H \leq 10^4

1 \leq N \leq 10^3

1 \leq A_i \leq 10^4

1 \leq B_i \leq 10^4

All values in input are integers.

Input

Input is given from Standard Input in the following format:

H N
A_1 B_1
:
A_N B_N

Output

Print the minimum total Magic Points that have to be consumed before winning.

Sample Input 1

9 3
8 3
4 2
2 1

Sample Output 1

4

First, let us cast the first spell to decrease the monster's health by 8, at the cost of 3 Magic Points. The monster's health is now 1.

Then, cast the third spell to decrease the monster's health by 2, at the cost of 1 Magic Point. The monster's health is now -1.

In this way, we can win at the total cost of 4 Magic Points.

Sample Input 2

100 6
1 1
2 3
3 9
4 27
5 81
6 243

Sample Output 2

100

It is optimal to cast the first spell 100 times.

Sample Input 3

9999 10
540 7550
691 9680
700 9790
510 7150
415 5818
551 7712
587 8227
619 8671
588 8228
176 2461

Sample Output 3

139815

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

//無理じゃカス

import java.util.Arrays;
import java.util.Scanner;
public class Main {
	//最大公約数gcd
	static int gcd (int a, int b) {
		int temp;
		while((temp = a%b)!=0) {
			a = b;
			b = temp;
		}
		return b;
	}
	
	
//最小公倍数lcm
	static int lcm (int a, int b) {
		int temp;
		long c = a;
		c *= b;
		while((temp = a%b)!=0) {
			a = b;
			b = temp;
		}
		return (int)(c/b);
	}

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int h = stdIn.nextInt(); //体力
		int n = stdIn.nextInt(); //魔法の種類
		
		int[] a = new int[n]; //モンスターの体力を削る
		int[] b = new int[n]; //魔力消費
		
		for(int i = 0; i < n; i++) {
			a[i] = stdIn.nextInt();
			b[i] = stdIn.nextInt();
		}
		
		int max = 0;
		for(int i = 0; i < n-1; i++) {
			max = Math.max(max, lcm(a[i],a[i+1]));
		}
		
		int[] don = new int[n];
		int min = Integer.MAX_VALUE;
		
		for(int i = 0; i < n; i++) {
			int llcm = max/a[i];
			don[i] = b[i]*llcm;
			min = Math.min(don[i], min);
		}
		
		
		int index = 0;
		for(int i = 0; i < n; i++) {
			if(min == don[i]) {
				index = i;
			}
		}
		
		int cnt = 0;
		
		int attack = h / a[index]; //最適に攻撃する回数
		
		int ans = attack * b[index];
		
		if(attack * a[index]== h) {
		}else {
		/*	Arrays.sort(b);
			int batack = (h-(a[index]*attack)+b[0]-1)/b[0];
			ans += b[0] * batack;
			System.out.println(ans);*/
			int minmin = Integer.MAX_VALUE;
			int maxmax = 0;
			
			for(int i = 0; i < n-1; i++) {
				if(i == index || i == index-1) {
					continue;
				}else {
					maxmax = Math.max(maxmax, lcm(a[i],a[i+1])); 
				}
			}
			int []dondon = new int[n-1];
			for(int i = 0; i < n; i++) {
				if(i==index) {
					continue;
				}else {
					int lllcm =maxmax/a[i];
					dondon[i] = b[i] * lllcm;
					minmin = Math.min(minmin, dondon[i]);
				}
			}
			int indexindex = 0;
			for(int i = 0; i < n; i++) {
				if(minmin == dondon[i]) {
					indexindex = i;
				}
			}
			ans += (h-(a[index]*attack)+a[indexindex]-1)/a[indexindex]*b[indexindex];
			
			System.out.println(ans);
			
		}
		
	}

}