#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
const int MOD=1e9+7;
const long long INF = 1LL<<60;
void YN(bool x){
  if(x) cout<<"Yes";
  else cout<<"No";
}

int main(){
    int64_t N,S=0;cin>>N;
    vector<int64_t> A(N);
    rep(i,N){
        cin>>A[i];
        S+=A[i];
    }
    bool f=true;
    if(S%N!=0)f=false;
    else{
        S/=N;
        rep(i,N-1){
            if(A[i]>S)f=false;
            else A[i+1]-=S-A[i];
        }
        if(A[N-1]!=S)f=false;
    }
    YN(f);
    
    
}