#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N; int A[101]; set S[128]; void solve() { int i,j,k,l,r,x,y; string s; cin>>N; FOR(i,N) cin>>A[i]; for(int mask=1;mask<1<0; submask=(submask-1)&mask) { int ot=mask^submask; FORR(a,S[submask]) FORR(b,S[ot]) { if(abs(a-b)<1e-9) return _P("YES\n"); if(mask!=(1<=1e-9) S[mask].insert(a/b); } } } } } return _P("NO\n"); } int main(int argc,char** argv){ string s;int i; if(argc==1) ios::sync_with_stdio(false), cin.tie(0); FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin); solve(); return 0; }