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C.cpp
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C.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define loop(i,a,b) for(ll i=a;i<b;i++)
#define testcases ll t;cin>>t;while(t--)
#define pb push_back
#define all(x) x.begin(), x.end()
#define dec(x) greater<x>()
const ll maxn=1e5+10;
int main()
{
#ifndef ONLINE_JUDGE
freopen("C:/Users/91731/Documents/input.txt","r",stdin);
freopen("C:/Users/91731/Documents/output.txt","w",stdout);
freopen("C:/Users/91731/Documents/error.txt","w",stderr);
#endif
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
ll n,r,avg,sum=0;
cin>>n>>r>>avg;
pair<ll,ll> pa[maxn];
loop(i,0,n)
{
cin>>pa[i].second>>pa[i].first;
sum+=pa[i].second;
}
sort(pa,pa+n);
ll need=avg*n-(sum);
ll ans=0,i=0;
while(need>0)
{
ll z=min(need,r-pa[i].second);
ans+=z*pa[i].first;
need-=z;
i++;
}
cout<<ans;
}