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#include <stdio.h>
int n,c;
int a[1501],cost[1501],set[2001];
int main()
{
freopen ("carnati.in","r",stdin);
freopen ("carnati.out","w",stdout);
scanf("%d%d",&n,&c);
int p1,t;
for(int i=1;i<=n;i++)
{
scanf("%d%d",&p1,&t);
set[i]=t;
a[p1]+=t;
}
int maxim=0,v,mpos;
for(int val=1;val<=n;val++)
{
for(int i=1;i<=1500;i++)
{
if(a[i]>=set[val])
{
if(cost[i-1]+set[val]>=0) cost[i]=cost[i-1]+set[val];
else cost[i]=0;
}
else cost[i]=cost[i-1];
cost[i]-=13;
if(cost[i]<0) cost[i]=0;
}
for(int i=1;i<=1500;i++)
{
if(maxim<cost[i])
{
mpos=i;
maxim=cost[i];
}
// cost[i]=0;
}
}
printf("%d\n",maxim);
}