#!/bin/python3

import sys

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