vbxfbgfntfgbngfbngf

include <bits/stdc++.h> using namespace std;

int main() {

long long n,a=0,b=0,ans=0; cin>>n; for(int i=1;i<=n;i++) {

cin>>b;
ans+=abs(a-b);
a=b;

} cout<<ans<<endl; return 0; }