#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define ll long long #define ld long double #define EPS 0.0000000001 #define INF 1e9 #define LINF (ll)INF*INF #define MOD 1000000007 #define rep(i,n) for(int i=0;i<(n);i++) #define loop(i,a,n) for(int i=a;i<(n);i++) #define all(in) in.begin(),in.end() #define shosu(x) fixed< vi; typedef vector vs; typedef pair pii; typedef vector vp; int gcd(int a, int b){ if(b==0) return a; return gcd(b,a%b); } int lcm(int a, int b){ return a*b/gcd(a,b); } signed main(void) { int n = 9; vi a(n); rep(i,n) cin >> a[i]; loop(i,1,11){ bool c = false; rep(j,n)if(a[j] == i)c = true; if(c == false){ cout << i << endl; return 0; } } }