#include<iostream>// in out using namespace std; int main(){ /** int a; cin>>a; cout<<a; int a,b; cin>>a>>b; cout<<a+b; int x,y ; cin>>x>>y; cout<<x*y; int a,s,d; cin>>a>>s>>d; cout<<a*s*d; int a,b,c; cin>>a>>b>>c; cout<<(a+b)/c; int a,b,c,d,f; a =b = c = d= 220; f = 1000; cout<<f-(a+b+c+d); long long a,b; cin>>a>>b; cout<<(a*10+b)*(a*10+b); int a,b; cin>>a>>b; cout<<a*b;**/ int a,b,c,d; cin>>a>>b>>c>>d; cout<<(c+d)/(a+b); return 0; }