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#include <bits/stdc++.h>
#define maxn 102

using namespace std;

int  x[maxn], y[maxn], n;
int main(){
    cin >> n;

    for ( int i = 1; i <= n; i++)
        cin >> x[i] >> y[i];

    for ( int i = 1; i <= n - 1; i++)
        for ( int j = i + 1; j <= n; j++)
            if ( y[i] > y[j] ) { swap(y[i], y[j]); swap(x[i], x[j]); }

    int mid = y[ n / 2 + 1]; int tong = 0;

    for ( int i = 1; i <= n; i++)
        tong += abs( y[i] - mid );

    cout << tong;
}