@@ -0,0 +1,5 @@
+sum=0
+for i in range (0,6):
+	a=int(input())
+	sum+=a
+print(sum/6)
@@ -0,0 +1,5 @@
+t = int(input())
+while t>0:
+  t-=1
+  n1, n2 = map(int, raw_input().split())
+  print n1*n2
@@ -0,0 +1,19 @@
+def sum(x):
+    if x < 0:
+        return -(-x * (-x + 1) // 2)
+    else:
+        return x * (x + 1) // 2
+
+while True:
+    try:
+        a, b = map(int, input().split())
+        if a > b:
+            a, b = b, a
+        if b < 0:
+            print(sum(a) - sum(b + 1))
+        elif a <= 0:
+            print(sum(b) + sum(a))
+        else:
+            print(sum(b) - sum(a - 1))
+    except EOFError:
+        exit(0)