C++ 알고리즘 - 백준 2869 달팽이는 올라가고 싶다

https://www.acmicpc.net/problem/2869

 

#include <iostream>
#include <cmath>
#define endl "\n"

using namespace std;

int main(void) {
	// C++ Init
	ios::sync_with_stdio(false);
	cin.tie(NULL);

	double input1, input2, input3;
	cin >> input1 >> input2 >> input3;

	cout << int(ceil((input3 - input1) / (input1 - input2)) + 1);
}