#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define ll long long
#define pri pair<int,int>
#define prl pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define vp vector<pair<int,int>>
#define vpl vector<pair<ll,ll>>
#define re return 0
#define sqrt sqrtl
int32_t main() {
int n;cin>>n;
int sum = 0;
vector<int> st(n);
for (int i = 0;i<n;i++) {
int t;cin>>t>>st[i];
sum+=t;
}
sort(st.begin(),st.end(),greater<int>());
vector<int> c(n,0);
int a = 0;
for (int i = 0;i<n;i++) {
c[i] = min(st[i],sum);
sum-=c[i];
if (c[i]==0) a++;
}
cout<<a<<endl;
for (int i = 0;i<n;i++) {
cout<<c[i]<<" ";
}cout<<endl;
return 0;
}
