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#include<cstdio>
int gen[1001],cst[1001],sum[5000001],csum[5000001];
int main(){
freopen("energii.in","r",stdin);
freopen("energii.out","w",stdout);
int s=0,i,j,g,w,min=99999999,sol;
scanf("%d%d",&g,&w);
for(i=1;i<=g;i++){
scanf("%d%d",&gen[i],&cst[i]);
s+=gen[i];
}
for(i=1;i<=g;i++){
csum[gen[i]]=cst[i];
for(j=1;j<=s;j++)
if(sum[j]!=0)
csum[j+gen[i]]=sum[j]+cst[i];
for(j=1;j<=s;j++)
if(csum[j]!=0&&sum[j]==0){
sum[j]=csum[j];
csum[j]=0;
}
}
i=1;
while(i<s){
i++;
if(i>=w&&sum[i]<min&&sum[i]!=0){
min=sum[i];
sol=i;
}
}
printf("%d",min);
return 0;
}