d, l, v1, v2 = map(int, input().split())
print((l - d) / (v1 + v2))
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
double d, l, v1, v2, ans;
cin>>d>>l>>v1>>v2;
ans = (l - d) / (v1+v2);
printf("%.10f", ans);
}Non empty subsets | 1630A - And Matching |
1630B - Range and Partition | 1630C - Paint the Middle |
1630D - Flipping Range | 1328A - Divisibility Problem |
339A - Helpful Maths | 4A - Watermelon |
476A - Dreamoon and Stairs | 1409A - Yet Another Two Integers Problem |
977A - Wrong Subtraction | 263A - Beautiful Matrix |
180C - Letter | 151A - Soft Drinking |
1352A - Sum of Round Numbers | 281A - Word Capitalization |
1646A - Square Counting | 266A - Stones on the Table |
61A - Ultra-Fast Mathematician | 148A - Insomnia cure |
1650A - Deletions of Two Adjacent Letters | 1512A - Spy Detected |
282A - Bit++ | 69A - Young Physicist |
1651A - Playoff | 734A - Anton and Danik |
1300B - Assigning to Classes | 1647A - Madoka and Math Dad |
710A - King Moves | 1131A - Sea Battle |