#include <iostream>
using namespace std;
int main() {
    int a, c, b, year;
    double a1, b1, c1;
    cin >> a >> b >> c;
    a1=static_cast <double>(a);
    if(a1<=1024*1024*1024*2-1 && b<=1024*1024*1024*2-1 && c>=1 && c<=100 && a>0 && b>0) {
    for(year=1; a1=a1*(100-c)/100; year++) {
                if (a1<=b) {
                        cout << year;
                        break;
                        }
                        }
                        }
    cin.get(); cin.get();
    return 0;
}