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#include <fstream>
using namespace std;
ifstream in("energii.in");
ofstream out("energii.out");
int f[2][1002], e, c, g, w, k, i, j;
int main()
{
in>>g>>w;
for(i=1;i<=w;i++)
{
f[0][i]=100002;
f[1][i]=100002;
}
for(i=1;i<=g;i++)
{
k=1-k;
in>>e>>c;
for(j=e;j<=w;j++)
{
f[k][j]=f[1-k][j];
if(f[1-k][j-e]+c<f[k][j]) f[k][j]=f[1-k][j-e]+c;
}
}
out<<f[k][w];
return 0;
}