#include<iostream>
#include<cmath>
using namespace std;
int a[10010],b[100010];
int main()
{
	int maxx=-10000,minn=10000,min1=10001,n;
    cin>>n;
    for(int i=1;i<=n;i++)
	{ 
		cin>>a[i]>>b[i];
		maxx=max(maxx,b[i]);
		minn=min(minn,b[i]);
	}
	for(int i=minn;i<=maxx;i++)
	{
		int sum=0;
		for(int j=1;j<=n;j++)
		{
			sum+=abs(b[j]-i);
		}
		min1=min(min1,sum);
	}
	cout<<min1;
 	return 0;
}