#include <bits/stdc++.h>
using namespace std;
using pii = pair<int,int>;
#define int long long
#define FOR(i , a , b) for(int i = a ; i < b ; i++)
#define REP(i , a , b) for(int i = a ; i <= b ; i++)
#define FORD(i , a , b) for(int i = a ; i >= b ; i--)
#define FORE(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); i++)
#define el '\n'
#define all(x) x.begin(), x.end()
#define bit(x) (1 << (x))
#define log(...) logger(#__VA_ARGS__, __VA_ARGS__)
const int inf = 1e18;
const int base = 311;
const int mod = 1e9 + 7;
template <typename... Args> void logger(string vars, Args&&... values);
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
//Think
const int N = 20;
string name = "Task";
int f[bit(N)][N];
int n , m , x;
int cost[N] , staff[N];
void GOTO_OLP2025() {
cin >> n >> m >> x;
FOR(i , 0 , m) cin >> cost[i];
FOR(i , 0 , m){
FOR(j , i + 1 , m){
if(cost[i] + cost[j] == x){
cout << "YES" << el;
return;
}
}
}
cout << "NO" << el;
}
void file(string s){
string in = s + ".in";
string out = s + ".out";
if(fopen(in.c_str() , "r")){
freopen(in.c_str() , "r" , stdin);
}
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
file(name);
//int t ; cin >> t;
//while(t--)
GOTO_OLP2025();
return 0;
}
template <typename... Args>
void logger(string vars, Args&&... values) {
cerr << "[";
stringstream ss(vars);
string var;
vector<string> varNames;
while (getline(ss, var, ',')) {
while (!var.empty() && var.front() == ' ') var.erase(0, 1);
varNames.push_back(var);
}
string delim = "";
size_t i = 0;
((cerr << delim << varNames[i++] << " = " << values, delim = ", "), ...);
cerr << "]\n";
}
