#include<iostream>#include<cmath>using namespace std;#define EPS 0.00001int main(){ double B, W, C; while(scanf("%lf%lf%lf", &B, &W, &C) && (B + W + C)) { B *= 16, W *= 16; double ans = B / W; double raW = 0, raB = 1; int sum = 0; while(fabs(raW / (1 - raW) - ans) > EPS || fabs(raB / (1 - raB) - ans) > EPS) { raW = 1 - (W * (1 - raW) + C * (1 - raB)) / (C + W); raB = ((B - C) * raB + C * raW) / B; sum ++; } printf("%dn", sum); }}
