#include<stdio.h>
int main()
{
    int a,b,c,m,n,f=0,t=0,o=2,j=2,s=0,r=0;
    int x[105],y[105];
    scanf("%d %d %d",&a,&b,&c);
    for(int i=0;i<c;i++)
    {
        scanf("%d %d",&f,&t);
        if(f==0)
        {
            x[o++]=t;
        }
        else
        {
            y[j++]=t;
        }
    }
    for(int i=0;i<o;i++)
        {
            for(int p=i+1;p<o;p++)
            {
                if(x[i]>x[p])
                {
                c=x[i];
                x[i]=x[p];
                x[p]=c;
                }
            }
        }
    for(int i=1;i<o;i++)
    {
        if(s<x[i]-x[i-1])
        {
            s=x[i]-x[i-1];
        }
    }
        for(int i=0;i<j;i++)
        {
            for(int p=i+1;p<j;p++)
            {
                if(x[i]>x[p])
                {
                c=x[i];
                x[i]=x[p];
                x[p]=c;
                }
            }
        }
    for(int i=1;i<j;i++)
    {
        if(r<x[i]-x[i-1])
        {
            r=x[i]-x[i-1];
        }
    }
    printf("%d\n",s);
}

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