main.cpp

#include <cstdio>

int div(int a, int b) {
	if (b == 0) {
		return -1;
	}
	int acc = 0;
	int c = 1;
	while(!(a < b)) {
		b <<= 1;
		c <<= 1;
	}
	while(c > 1) {
		c >>= 1;
		b >>= 1;
		if(a >= b) {
			acc += c;
			a -= b;
		}
	}
	return acc;
}

int main() {
	printf("%d\n", div(20000000, 9));
	return 0;
}