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#include <fstream>
#include <climits>
using namespace std;
ifstream cin("energii.in");
ofstream cout("energii.out");
int g,w,i,cmin=INT_MAX,G[1001],C[1001],W[1001],cost=0,j;
int main()
{
cin>>g>>w;
for(i=1;i<=g;i++)
cin>>G[i]>>C[i];
for(i=1;i<=g;i++){
cost=0;
j=i;
while(cost<w&&j<=g){
cost+=C[j];
j++;
}
cmin=min(cmin,cost);
}
cout<<cmin;
return 0;
}