#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ll n,m,i,j,k=0,a,b,x,y;
cin>>n;
set<pair<ll,ll> > s;
for(i=0;i<n;i++){
cin>>a>>b;
for(x=0;x<a;x++){
for(y=0;y<b;y++){
s.insert( {x,y });
}
}
}
cout<<s.size();
}
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