#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
	int x, y, s;
	
	while (cin>>x>>y>>s, x||y||s) {		
		int ans = -1;
		
		for (int i=1; i<s; i++) {
			for (int j=1; j<s; j++) {
				if (i*(100+x)/100 + j*(100+x)/100 == s) {
					ans = max(ans, i*(100+y)/100+j*(100+y)/100);
				}
			}
		}
		
		cout << ans << endl;
	}
}