Cookie problem from GSoC 2014 in C

problem_b.c

#include <stdio.h>

double calculateTime(double c, double f, double x) {
    double totalTime = 0;
    int n = 0;
    double timeWithCurrent, timeForFarm, timeWithFarm;
    do {
        timeWithCurrent = x/((f*n)+2);
        timeForFarm = c/((f*n)+2);
        timeWithFarm = timeForFarm+(x/(((1+n)*f)+2));
        if(timeWithFarm > timeWithCurrent) {
            totalTime += timeWithCurrent;
            break;
        } else {
            n += 1;
            totalTime += timeForFarm;
        }
    } while (1);
    return totalTime;
}

int main() {
    printf("%.7f\n", calculateTime(30.0, 2.0, 100.0));
    return 0;
}