Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sum of 1938 values where 1933 values are under 68.3 and 1940 valures are under 4.02?

### Inputs:
table_name: table, columns: ['Table 2: Depression Data', '1929', '1931', '1933', '1937', '1938', '1940']

### Response:
SELECT SUM 1938 FROM table WHERE 1933 < 68.3 AND 1940 < 4.02