#include <iostream>
int main() {
float position{};
float relative_position;
int speed;
int length;
int exten_speed;
int ticks{};
std::cin >> speed >> length >> exten_speed;
while ( (relative_position = position/length) < 1 )
{
length+=exten_speed;
position = relative_position * length;
position+=speed;
ticks++;
}
std::cout << ticks;
return 0;
}
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