#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
int n , k;
cin>>n>>k;
vector<int>a(n) , b(n);
for(int i = 0 ; i < n ;i++){
cin>>a[i]>>b[i];
}
sort(a.begin() , a.end());
int ans = 0;
cout << accumulate(a.begin() , a.begin() + k , 0LL);
}
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