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#include<iostream>
using namespace std;
long a[100000001]={0};
int main()
{
    int i,j,n,m;
    long x,y,most=0,cha=0;
    cin>>n>>m;
    for(i=0;i<n;i++)
    {
        cin>>x>>y;
        for(j=x;j<y;j++)
            a[j]=1;
        if(y>most)
            most=y;
    }
    for(i=0;i<m;i++)
    {
        cin>>x>>y;
        for(j=x;j<y;j++)
            a[j]=2;
        if(y>most)
            most=y;
    }
    for(i=1;i<=most;i++)
        if(a[i]==1)
        cha++;
    cout<<cha;
}
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