#include <bits/stdc++.h> using namespace std; #define endl '\n' #define f first // #define s second #define pb(x) push_back(x) #define int long long const int MOD = 1e9+7; const int inf = 1e9; const int INF = 1e18+20; const int LOG = 25; void solve() { int n, m; cin>>n>>m; vector<int> a(n); for (int i=0; i<n; i++) { cin>>a[i]; } for (int i=0; i<m; i++){ int x, y; cin>>x>>y; } int ans=0; for (int i=1; i<n; i++) { ans+=abs(a[i] - a[i-1]); } cout<<ans<<endl; } bool multi=false; int32_t main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int t=1; if (multi) cin>>t; while (t--) solve(); return 0; }