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#include <bits/stdc++.h>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
struct object{
int val, wt;
} v[1001];
int n, W;
int KnapSack(int n, int W){
int dp[W + 1];
dp[0] = 0;
for(int i = 1;i <= W;i++){
dp[i] = INT_MAX;
for(int j = 1;j <= n;j++)
if(v[j].wt <= i) dp[i] = min(dp[i], dp[i - v[j].wt] + v[j].val);
}
return dp[W];
}
int main(){
f >> n >> W;
for(int i = 1;i <= n;i++)
f >> v[i].wt >> v[i].val;
g << KnapSack(n, W);
}