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

### Instruction:
what is the least number of goals for when the goals against is 70 and the ties less than 0?

### Inputs:
table_name: table, columns: ['Team', 'Games Played', 'Wins', 'Losses', 'Ties', 'Goals For', 'Goals Against']

### Response:
SELECT MIN Goals For FROM table WHERE Goals Against = 70 AND Ties < 0