#!/bin/python3

import sys

def howManyGames(p, d, m, s):
    count = 0
    while True:
        if p > m:
            if s - p < 0:
                break
            s = s - p
            p = p - d
            count += 1
            
        else:
            if s - m < 0:
                break
                
            s = s - m
            count += 1
            
    return count
        
            
        

if __name__ == "__main__":
    p, d, m, s = input().strip().split(' ')
    p, d, m, s = [int(p), int(d), int(m), int(s)]
    answer = howManyGames(p, d, m, s)
    print(answer)