#include <iostream> using namespace std; int a[1<<20], b[1<<20]; int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); int n, ch = 1, ans1 = 0, ans2 = 0; cin>>n; for (int i=0;i<n;i++) cin>>a[i]>>b[i]; while (ch){ ch = 0; for (int i=0;i<n;i++){ int k = max(0, a[i] - b[i]); k = (k>>1)<<1; ch += !!k; a[(i + 1) % n] += k / 2; a[i] -= k; } } for (int i=0;i<n;i++){ if (a[i] == b[i]) ans1++; else if (a[i] == b[i] + 1) ans2++; } if (ans1 == n or ans2 == n) cout<<"Yes\n"; else cout<<"No\n"; }