/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		Long p[] = new Long[n];
		long sum=0;
		for(int i=0;i<n;i++){
			long a = sc.nextLong();
			long b = sc.nextLong();
			// adding constant sum
			sum=sum+b*n-a;
			p[i] = a-b;
		}
 
		Arrays.sort(p,Collections.reverseOrder())
		;
		for(int j=1;j<=n;j++){
			// variable sum
			sum=(long)sum+j*p[j-1];
		}
		System.out.println(sum);
	}
}

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Mwo0IDIKMiAzCjYgMQo=

3
4 2
2 3
6 1