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#include<fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int optim[1000000], e, c, n, i, j, g, sol, ct;
int main() {
int mini = 1000000;
fin >> n; fin >> ct;
for (i = 1; i <= n; i++){
fin >> e >> c;
for (j = ct; j >= 0; j--){
if (optim[j] != 0){
if (j + e < ct){
if (optim[j + e] > optim[j] + c or optim[j + e] == 0)
optim[j + e] = optim[j] + c;
}
else{
if (mini > optim[j] + c)
mini = optim[j] + c;
}
}
}
if (e >= ct and mini > c)
mini = c;
if (optim[e] == 0 or optim[e] > c)
optim[e] = c;
}
// for (i = 1; i <= ct; i++)
// fout << optim[i] << " ";
fout << mini;
}