#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max ()\min() using namespace std; int main(){ long long a,b,c,d; cin>>a>>b>>c>>d; cout<<(c*10+d)/(a*10+b)<<endl; return 0; }