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#include <iostream>
int main()
{
    int m,n;
std::cin>>n>>m;
while(n>1)
{
int a,b;
std::cin>>a>>b;
n--;
}
int mini=-1,maks=-1;
while(m>0)
{
int a;
std::cin>>a;
if(a<mini || mini==-1)
mini=a;
if(a>maks||maks==-1)
maks=a;
m--;
}
std::cout<<maks-mini;
    return 0;
}