#include <bits/stdc++.h>
using namespace std;

int main(){
    int a, b;
    cin >> a >> b;
    cout << 2*a + 100 - b;
}

#include <bits/stdc++.h>
#define endl "\n"
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
typedef pair<ll, ll> PP;
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define rrep(i, n) for(ll i = n - 1; i > -1; i--)
#define all(v) v.begin(), v.end()
#define pb push_back
#define fi first
#define se second
template <class X> void print(X x) { cout << x << endl; }
void print(vl x) {
    for(ll i : x) {
        cout << i << " ";
    }
    cout << endl;
}
const ll INF = (1LL << 61) - 1;
const ll MOD = 1000000007 /*998244353*/;
const ll MAX_N = 500010;
ll a, b, c, d, e, f, h, x, y, z, p, q, n, t, r, k, w, l, ans, i, j, u, v, m;
ll codeforces = 1;
string S, T;
vector<vl> g(MAX_N);
vl A, B;
void input() { cin >> x >> y; }
void solve() { print(x * 2 + 100 - y); }
int main() {
    // cout<<fixed<<setprecision(15);
    cin.tie(0);
    ios::sync_with_stdio(false);
    input();
    while(codeforces--) {
        solve();
    }
}