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class Solution {
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 public:
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  int solve(string s) {
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    int hour = stoi(s.substr(0, 2));
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    int min = stoi(s.substr(3, 5));
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    return hour * 60 + min;
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  }
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  int numberOfRounds(string loginTime, string logoutTime) {
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    int st = solve(loginTime);
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    int et = solve(logoutTime);
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    int ans = 0;
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    if (st > et) et = et + 1440;
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    if (st % 15 != 0) st = st + (15 - st % 15);
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    ans = (et - st) / 15;
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    return ans;
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  }
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};