long factorial(long x) {
	if (x == 0) {
		return 1;
	} else {
		return x * factorial(x-1);
	}
}

long fibonacci(long x) {
	return x > 0 ?
		x > 1 ?
			fibonacci(x-1) + fibonacci(x-2)
		: 1
		: 0;
}

long gcd(long a, long b) {
	while (a != 0) {
		long temp = a;
		a = b % a;
		b = temp;
	}
	return b;
}

int main(int argc, char **argv) {
	int exp = 0;
	int i;
	int j;
	for (i = 0; i < 10; ++i) {
		for (j = 0; j < 10; ++j) {
			if (j >= i) break;
			exp += 1;
		}
		if (i >= 5) break;
	}
	return exp ;
}