import sys
input = sys.stdin.readline  # "\n"を含む

def solve(a, b, c, d, m):
    x, y = a+c, b+d

    if y - x >= m:
        return m-1

    x %= m
    y %= m
    if x <= y:
        return y
    else:
        return m-1

def main():
    a, b, c, d, m = map(int, input().split())
    res = solve(a, b, c, d, m)
    print(res)

if __name__ == "__main__":
    main()