This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define ft first
#define sd second
#define pb push_back
#define nl "\n"
#define int ll
typedef long long ll;
typedef long double ld;
using namespace std;
const int mod = 1e9 + 7;
const int N = 2000;
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cout << fixed << setprecision(9);
int T = 1;
while(T--) {
int n, k;
cin >> n >> k;
double a[n], b[n];
for (int i = 0; i < n; i++) {
cin >> a[i] >> b[i];
}
sort(a, a + n);
double s = 0;
for (int i = 0; i < k; i++) {
s += a[i];
}
cout << s << nl;
}
}
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