#include<bits/stdc++.h>
using namespace std;
#define int long long
int32_t main(){
int n,m; cin>>n>>m;
vector<int> h(n); for(int i = 0; i < n; i++) cin>>h[i];
vector<vector<int>> adj(n);
for(int i = 0; i < m; i++){
int a,b; cin>>a>>b;
}
int ans = 0;
for(int i = 1; i < n; i++) ans += abs(h[i]-h[i-1]);
cout<<ans<<'\n';
}
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