u32 c(u32 n) {
	u32 sum = 0u32;
	while(n > 0u32) {
		sum += n;
		n -= 1u32;
	}
	return sum;
}


u64 fib(u64 i) {
	u64 fibA = 0u64;
	u64 fibB = 1u64;

	while((i -= 1u64) > 0u64) {
		u64 tmp = fibB;
		fibB = fibA + fibB;
		fibA = tmp;
	}

	return fibA;
}