Calculate running time of hw2 and explain please

int hw1(int n) { int a = 0; int b = n; while ( b >= 0 ) { int c = n*n; while ( c >= 1) { c = c / 2; a = a + b*c; } b = b - 4; } return a; }

int hw2(int n) { int res = hw1(n*n); if (res > 1000) { for (int z =0; z < n; z++) { res += hw1(n); } } return res; }