import std.stdio, std.conv, std.functional, std.string;
import std.algorithm, std.array, std.container, std.range, std.typecons;
import std.numeric, std.math, std.random;
import core.bitop;

string FMT_F = "%.10f";

static File _f;
void file_io(string fn) { _f = File(fn, "r"); }
static string[] s_rd;
T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; }
T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; }
T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; }
T[] RDA(T = long)(T fix = 0) { if (_f.isOpen)  return _RDA!T(_f, fix); else return _RDA!T(fix); }

size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

bool inside(T)(T x, T b, T e) { return x >= b && x < e; }
long lcm(long x, long y) { return x * (y / gcd(x, y)); }

long mod = 10^^9 + 7;
//long mod = 998244353;
//long mod = 1_000_003;
void moda(ref long x, long y) { x = (x + y) % mod; }
void mods(ref long x, long y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(ref long x, long y) { x = (x * y) % mod; }

void main()
{
	auto P = RD;
	auto Q = RD;
	auto A = RD;

	bool f(long x)
	{
		auto cost1 = x * ((100+P)/100.0);
		auto cost2 = x * ((100+Q)/100.0) + A;
		debug writeln(x, ":", cost1, " < ", cost2);
		return cost1 < cost2;
	}

	long ok, ng;
	ok = 0; ng = (10^^9)+1;
	while (abs(ok-ng) > 1)
	{
		auto mid = (ok+ng) / 2;
		if (f(mid))
			ok = mid;
		else ng = mid;
	}

	auto ans = ok;
	foreach (i; max(10000000, ok-10000000)..max(10000000, ok+1))
	{
		auto cost1 = i * ((100+P)/100.0);
		auto cost2 = i * ((100+Q)/100.0) + A;
		if (cast(long)cost1 >= cast(long)cost2)
			--ans;
	}
	foreach (i; 1..min(10000001, ok+1))
	{
		auto cost1 = i * ((100+P)/100.0);
		auto cost2 = i * ((100+Q)/100.0) + A;
		if (cast(long)cost1 >= cast(long)cost2)
			--ans;
	}

	writeln(ans);
	stdout.flush();
	debug readln();
}