import std.stdio, std.string, std.conv, std.array, std.algorithm; import std.uni, std.range, std.math, std.container, std.datetime; import core.bitop, std.typetuple, std.typecons; immutable long MOD = 1_000_000_007; alias tie = TypeTuple; void main(){ auto N = readln.chomp.to!int; int H, M, h, m; int day = 24 * 60; int ans; foreach(i ; 0 .. N){ readf("%d:%d %d:%d\n", &H, &M, &h, &m); ans += (60*h + m - 60*H - M + day) % day; } writeln(ans); } void readVars(T...)(auto ref T args){ auto line = readln.split; foreach(ref arg ; args){ arg = line.front.to!(typeof(arg)); line.popFront; } if(!line.empty){ throw new Exception("args num < input num"); } }