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#include <bits/stdc++.h>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
#define cin fin
#define cout fout
int n, gmax;
vector<int> dp(5001, INT_MAX);
int w[1001],v[1001];
int main() {
cin >> n >> gmax;
for(int i = 1; i <= n; i++) {
cin >> w[i] >> v[i];
}
dp[0]=0;
for(int i = 1; i <= n; i++) {
for(int j = w[i]; j <= gmax; j++) {
dp[j]=min(dp[j], dp[j-w[i]]+v[i]);
}
}
cout << dp[gmax];
return 0;
}