# Ground state energies
## Available Coupled Cluster Methods
- [`CCS`](./../general_sections/jobs.md#CCS)
- [`PE-CCS`](./../embedding_schemes/pe.md#how-to-include-pe)
- [`CC2`](./../general_sections/jobs.md#CC2)
- [`CCSD`](./../general_sections/jobs.md#CCSD)
- [`PE-CCSD`](./../embedding_schemes/pe.md#how-to-include-pe)
- [`RR-CCSD`](./../general_sections/jobs.md#RR-CCSD)
- [`CC3`](./../general_sections/jobs.md#CC3)
- [`CCSD(T)`](./../general_sections/jobs.md#CCSD(T))
- [`CCSDT`](./../general_sections/jobs.md#CCSDT)
- [`CCSDTQ`](./../general_sections/jobs.md#CCSDTQ)
## Available Cluster Perturbation Methods
- [`CPS(D)`](./../general_sections/jobs.md#CPS(D))
- [`CPSD(T)`](./../general_sections/jobs.md#CPSD(T))
## Available Møller-Plesset Methods
- [`MP2`](./../general_sections/jobs.md#MP2)
- [`UMP2`](./../general_sections/jobs.md#UMP2)
- [`MP3`](./../general_sections/jobs.md#MP3)
- [`MP4SDQ`](./../general_sections/jobs.md#MP4SDQ)
- [`MP4`](./../general_sections/jobs.md#MP4)

## Example Input File
An example input file for CCS takes the following form:
```
@method settings
basis: STO-3G
@end

@memory
max_mem: 1
@end

@jobs
task: ccs
@end

@ccs
solver_thresh: 1.0E-12
restart: False
@end

@scf
conv_thresh: 1.0E-12
@end

@molecule
charge: 0
multiplicity: 1
units: bohr
xyz:
O        0.0000000000    0.0000000000    0.0000000000
H        0.0000000000    1.4304281903    1.1071565216
H        0.0000000000   -1.4304281903    1.1071565216
@end
```