save project

h.py

-try:
-    age=int(input('你今年几岁了'))
-except:
-    print('要输入整数')
-else:
-    if age < 18:
-        print('不可以喝酒')
-print('程序结束~')
\ No newline at end of file
+a = 1
+summ = 1
+n = 4
+for i in range(2, n + 1):
+    a += 1
+    summ += a
+print(summ)
\ No newline at end of file