# -*- coding: utf-8 -*-
"""
Created on Sun Sep 26 11:31:55 2021

@author: 大翔
"""

a,b,c,d,m=map(int,input().split())
if a == b and c == d:
    print((b+d)%m)
elif b+d <= m:
    print(b+d)
else:
    print(m-1)