#include <bits/stdc++.h>

#define DEBUG(C) cerr << #C << " = " << C << endl

using namespace std;

const int MAX = 44;
int n;
long long a[MAX], b[MAX];
const long long inf = 1e18;

int main() {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%lld%lld", a + i, b + i);
  }
  long long ans = inf;
  for (unsigned i = 0; i < (1ll << n); i++) {
    long long asum = 0, bsum = 0;
    for (int j = 0; j < n; j++) {
      if (i & (1ll << j)) asum += a[j];
      else bsum += b[j];
    }
    ans = min(ans, llabs(asum - bsum));
  }
  printf("%lld\n", ans);
  return 0;
}