#include <bits/stdc++.h>
using namespace std;
// #define LOCAL // 提出時はコメントアウト
#define DEBUG_

typedef long long ll;
const double EPS = 1e-9;
const ll INF = ((1LL<<62)-(1LL<<31));
typedef vector<ll> vecl;
typedef pair<ll, ll> pairl;
template<typename T> using uset = unordered_set<T>;
template<typename T, typename U> using mapv = map<T,vector<U>>;
template<typename T, typename U> using umap = unordered_map<T,U>;

#define ALL(v) v.begin(), v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i, n) REP(i, 0, n)
#define sz(x) (ll)x.size()
ll llceil(ll a,ll b) { return (a+b-1)/b; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> vector<vector<T>> genarr(ll n, ll m, T init) { return vector<vector<T>>(n,vector<T>(m,init)); }

///// DEBUG
#define DUMPOUT cerr
#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)
template<typename T>istream&operator>>(istream&is,vector<T>&vec){for(T&x:vec)is>>x;return is;}
template<typename T,typename U>ostream&operator<<(ostream&os,pair<T,U>&pair_var){os<<"("<<pair_var.first<<", "<<pair_var.second<<")";return os;}
template<typename T>ostream&operator<<(ostream&os,const vector<T>&vec){os<<"{";for(int i=0;i<vec.size();i++){os<<vec[i]<<(i+1==vec.size()?"":", ");}
os<<"}";return os;}
template<typename T,typename U>ostream&operator<<(ostream&os,map<T,U>&map_var){os<<"{";repi(itr,map_var){os<<*itr;itr++;if(itr!=map_var.end())os<<", ";itr--;}
os<<"}";return os;}
template<typename T>ostream&operator<<(ostream&os,set<T>&set_var){os<<"{";repi(itr,set_var){os<<*itr;itr++;if(itr!=set_var.end())os<<", ";itr--;}
os<<"}";return os;}
void dump_func(){DUMPOUT<<endl;}
template<class Head,class...Tail>void dump_func(Head&&head,Tail&&...tail){DUMPOUT<<head;if(sizeof...(Tail)>0){DUMPOUT<<", ";}
dump_func(std::move(tail)...);}
#ifndef LOCAL
#undef DEBUG_
#endif
#ifdef DEBUG_
#define DEB
#define dump(...)                                                          \
DUMPOUT << "  " << string(#__VA_ARGS__) << ": "                            \
        << "[" << to_string(__LINE__) << ":" << __FUNCTION__ << "]"        \
        << endl                                                            \
        << "    ",                                                         \
    dump_func(__VA_ARGS__)
#else
#define DEB if (false)
#define dump(...)
#endif

//////////

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

int solve(ostringstream &cout) {
    #ifdef LOCAL
    ifstream in("../../Atcoder/input.txt");
    cin.rdbuf(in.rdbuf());
    #endif

    ll a,b;
    cin>>a>>b;

    ll x = a + b, y = b;
    ll ans = 4;
    if (x >= 15 && y >= 8) ans = 1;
    else if (x >= 10 && y >= 3) ans = 2;
    else if (x >= 3) ans = 3;

    cout << ans << endl;    

    return 0;
}

int main() {
    ostringstream oss;
    int res = solve(oss);

    cout << oss.str();
    return res;
}

#include "bits/stdc++.h"
using namespace std;
using LLI = long long;
#define INF 999999999
#define MOD 1000000007
#define FOR(i, s, e) for(LLI i = s, i##_lim = (e); i < i##_lim; i++)
#define FORR(i, s, e) for(LLI i = s-1, i##_lim = (e); i##_lim<=i; i--)
#define REP(i, n) FOR(i,0,n)
#define REPR(i, n) FORR(i,n,0)
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define bit(a, shift) ((a>>shift)&1))
#define pm(a) ((a)?1:-1)
#define SORT(v) sort(v.begin(),v.end())
#define RSORT(v) sort((v).rbegin(), (v).rend())
#define Mat2(type,name,h,w,def) vector<vector<type>> name(h,vector<type>(w, def))
#define Mat3(type,name,h,w,d,def) vector<vector<vector<type>>> name(h,vector<vector<type>>(w, vector<int>(d,def)))
// int 2.14E±9    LLIi 9.2E±18    double 1.7E±380


int main()
{
	cout << fixed << setprecision(10);

	int a, b, c, d;
	cin >> a >> b >> c >> d;

	cout << b - c;

	return 0;
}