# include<iostream> # include<algorithm> # include<string.h> using namespace std; struct nyx{ int x; int y; int z; }f[114514]; bool camp(nyx a,nyx b){ return a.z<b.z; } int main(){ int n,m,s=0; cin>>n; for(int i=0;i<n;i++){ cin>>f[i].x>>f[i].y; f[i].z=f[i].x+f[i].y; }sort(f,f+n,camp); cout<<f[0].z*n+n-1; return 0; }