#include <bits/stdc++.h>
#define all(x) x.begin(),x.end()
using i64 = long long;
#define int long long
std::mt19937 rng(69);
signed main()
{
int n;
std::cin>>n;
std::vector<int>extra(n);
int all_extra = 0;
for(int i=0;i<n;i++)
{
int a,b;
std::cin>>a>>b;
extra[i]=a-b;
all_extra+=extra[i];
}
std::multiset<int>a,b;
a.insert(0);
b.insert(0);
int lazy_a=0,lazy_b=0;
for(int i=1;i<n;i++)
{
//
lazy_b+=extra[i];
if(extra[i]<0)
{
lazy_a+=extra[i];
}
//adaug pante
a.insert(-lazy_a);
b.insert(-lazy_b);
while(*a.rbegin()+lazy_a>*b.begin()+lazy_b)
{
int aa=*a.rbegin();
int bb=*b.begin();
a.erase(a.find(aa));
b.erase(b.find(bb));
aa+=lazy_a-lazy_b;
bb+=-lazy_a+lazy_b;
a.insert(bb);
b.insert(aa);
}
}
int last=0,panta=-n;
i64 rez=0;
for(auto &oldc:a)
{
int c=oldc+lazy_a;
c=std::min(c,all_extra);
if(c>last)
{
rez-=panta*(c-last);
last=c;
}
panta++;
}
for(auto &oldc:b)
{
int c=oldc+lazy_b;
c=std::min(c,all_extra);
if(c>last)
{
rez-=panta*(c-last);
last=c;
}
panta++;
}
rez-=panta*(all_extra-last);
//std::cout<<rez<<' ';
//calculez pl mea dp ul in all_extra
std::vector<int>need(n+1,0);
for(int i=0;i<n;i++)
{
if(extra[i]<0)
{
need[i]=-extra[i];
}
}
need[n]=all_extra+1;
for(int i=0,j=0;i<n;i++)
{
int xd=extra[i];
while(xd>0)
{
int mn=std::min(xd , need[j]);
need[j]-=mn;
xd-=mn;
rez+=abs(i-j)*mn;
while(need[j]==0)
{
j++;
}
}
}
std::cout<<rez;
}
/*
2
2 0
0 1
*/
