#include<iostream>
using namespace std;
int main(){
    int x,y,x2,y2,ans;
    cin >> x >> y;
    cin >> x2 >> y2;
    if(x>y) ans = x;
    else ans = y;
    if(x == y && x2 == y2 && x2 < x) ans++;
    cout << ans << endl;
    return 0;
}