Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Single | US Cashbox | US Hot 100 | UK Singles |
| --- | --- | --- | --- | --- |
| 1969 | "Rock & Roll Holiday" | — | — | — |
| 1970 | "Be-Bop Confidential" | — | — | — |
| 1971 | "Roadrunner" | — | — | — |
| 1971 | "That's Fine" | — | — | — |
| 1972 | "The Red Back Spider" | 85 | 96 | — |
| 1973 | "Let Your Yeah Be Yeah" | 60 | 57 | 52 |
| 1973 | "Smokin' in the Boys Room" | 2 | 3 | 27 |
| 1974 | "I'm The Leader Of The Gang" | 26 | 48 | — |
| 1974 | "Kings Of The Party" | 31 | 31 | — |
| 1974 | "I Got It Bad For You" | — | — | — |
| 1977 | "Lady (Put The Light On Me)" | 44 | 46 | — |
| 1977 | "The Martian Boogie" | 45 | 59 | — |
| 1979 | "Love Stealer" | — | — | — |
Question:
what is the total number of singles released?
Answer:
13