// This is free and unencumbered software released into the public domain.

// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.

// In jurisdictions that recognize copyright laws, the author or authors
// of this software dedicate any and all copyright interest in the
// software to the public domain. We make this dedication for the benefit
// of the public at large and to the detriment of our heirs and
// successors. We intend this dedication to be an overt act of
// relinquishment in perpetuity of all present and future rights to this
// software under copyright law.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

// For more information, please refer to <http://unlicense.org>

/****************/
/* template.hpp */
/****************/

#include <algorithm>
#include <cassert>
#include <functional>
#include <iomanip>
#include <iostream>
#include <limits>

using std::cerr;
using std::cout;
using std::endl;
using std::max;
using std::min;
using std::swap;

struct BoolName : std::numpunct<char> {
  std::string t, f;
  BoolName(std::string t, std::string f) : t(t), f(f) {}
  std::string do_truename() const { return t; }
  std::string do_falsename() const { return f; }
};

void setBoolName(std::string t, std::string f) {
  cout.imbue(std::locale(cout.getloc(), new BoolName(t, f)));
}

struct Initializer {
  Initializer() {
    cout << std::fixed << std::setprecision(15) << std::boolalpha;
    setBoolName("Yes", "No");
  }
} initializer;

struct Input {
  bool eof;

  Input() : eof(false) {}

  operator bool() {
    int v;
    this->eof = (std::scanf("%d", &v) != 1);
    return v;
  }

  operator char() {
    char v;
    while (!(this->eof = (std::scanf("%c", &v) != 1)) && std::isspace(v)) {
    }
    return v;
  }

  operator int() {
    int v;
    this->eof = (std::scanf("%d", &v) != 1);
    return v;
  }

  operator long() {
    long v;
    this->eof = (std::scanf("%ld", &v) != 1);
    return v;
  }

  operator long long() {
    long long v;
    this->eof = (std::scanf("%lld", &v) != 1);
    return v;
  }

  operator unsigned int() {
    unsigned int v;
    this->eof = (std::scanf("%u", &v) != 1);
    return v;
  }

  operator unsigned long() {
    unsigned long v;
    this->eof = (std::scanf("%lu", &v) != 1);
    return v;
  }

  operator unsigned long long() {
    unsigned long long v;
    this->eof = (std::scanf("%llu", &v) != 1);
    return v;
  }

  operator double() {
    double v;
    this->eof = (std::scanf("%lf", &v) != 1);
    return v;
  }

  operator long double() {
    long double v;
    this->eof = (std::scanf("%Lf", &v) != 1);
    return v;
  }

  void ignore() const { getchar(); }
} in;

template <typename T> T abs(T a) { return a >= 0 ? a : -a; }

template <typename T, typename S> bool chmin(T &a, const S &b) {
  return a > b ? a = b, true : false;
}

template <typename T, typename S> bool chmax(T &a, const S &b) {
  return a < b ? a = b, true : false;
}

template <typename T, typename S> std::function<S(T)> cast() {
  return [](const T &t) { return static_cast<S>(t); };
}

template <typename T> T copy(const T &a) { return T(a); }

class ZeroPadding {
public:
  ZeroPadding(int n) : n(n) {}

  int n;
};

std::ostream &operator<<(std::ostream &os, const ZeroPadding &z) {
  os << std::setw(z.n) << std::setfill('0');
  return os;
}

template <typename T> constexpr T inf() {
  return std::numeric_limits<T>::max() / 2 - 1;
}

/******************/
/* arithmetic.hpp */
/******************/

template <typename T> class Addition {
public:
  template <typename V> T operator+(const V &v) const {
    return T(static_cast<const T &>(*this)) += v;
  }

  T operator++() { return static_cast<T &>(*this) += 1; }
};

template <typename T> class Subtraction {
public:
  template <typename V> T operator-(const V &v) const {
    return T(static_cast<const T &>(*this)) -= v;
  }
};

template <typename T> class Multiplication {
public:
  template <typename V> T operator*(const V &v) const {
    return T(static_cast<const T &>(*this)) *= v;
  }
};

template <typename T> class Division {
public:
  template <typename V> T operator/(const V &v) const {
    return T(static_cast<const T &>(*this)) /= v;
  }
};

template <typename T> class Modulus {
public:
  template <typename V> T operator%(const V &v) const {
    return T(static_cast<const T &>(*this)) %= v;
  }
};

template <typename T>
class IndivisibleArithmetic : public Addition<T>,
                              public Subtraction<T>,
                              public Multiplication<T> {};

template <typename T>
class Arithmetic : public IndivisibleArithmetic<T>, public Division<T> {};

/************/
/* time.hpp */
/************/

struct Time : public Addition<Time>, public Subtraction<Time> {
  int hour, minute, second;

  Time() : hour(0), minute(0), second(0) {}

  Time(int hour, int minute = 0, int second = 0)
      : hour(hour), minute(minute), second(second) {
    normalize();
  }

  int toMinutes() const { return hour * 60 + minute; }

  int toSeconds() { return toMinutes() * 60 + second; }

  void normalize() {
    while (second < 0) {
      --minute;
      second += 60;
    }
    while (second >= 60) {
      ++minute;
      second -= 60;
    }
    while (minute < 0) {
      --hour;
      minute += 60;
    }
    while (minute >= 60) {
      ++hour;
      minute -= 60;
    }
    while (hour < 0) {
      hour += 24;
    }
    while (hour >= 24) {
      hour -= 24;
    }
  }

  Time &operator+=(const Time &time) {
    hour += time.hour;
    minute += time.minute;
    second += time.second;
    normalize();
    return *this;
  }

  Time &operator-=(const Time &time) {
    hour -= time.hour;
    minute -= time.minute;
    second -= time.second;
    normalize();
    return *this;
  }
};

/************/
/* main.cpp */
/************/

int main() {
  int h1(in), m1(in), h2(in), m2(in), k(in);
  Time t1(h1, m1), t2(h2, m2);
  cout << (t2 - t1).toMinutes() - k << endl;
}


Measured memory_bytes: 3756