print 2 - 1;
print 1 + 1;
print 6 / 2;
print 2 * 2;
print 2 * 3 - 1;
print 1 + 2 + 3;
print 1 + 2 * 3;

print 2 <= 3 or false;
print 1 > 2;

print 1 == 1;
print 1 != 2;

print "hello, " + "world";