import std.algorithm, std.conv, std.range, std.stdio, std.string; void main() { auto rd = readln.split.to!(int[]), x = rd[0], y = rd[1], d = rd[2]; auto r = d + 1; if (d == 0) { r = 1; } else if (x + y < d) { r = 0; } else { if (x < d) r -= d - x; if (y < d) r -= d - x; } writeln(r); }