problem using in write to statement

problem as follows below

FORM f200_check_signature TABLES input STRUCTURE itcsy

ouput STRUCTURE itcsy.

DATA:sig(75) TYPE c,

totpayment type REGUH-RBETR,

compcode TYPE reguh-zbukr.

• DATA: wa_zchqlimit TYPE zchqlimit.

DATA: BEGIN OF int_zchqlimit,

zbukr LIKE zchqlimit-zbukr,

zsiglimit LIKE zchqlimit-zsiglimit,

zsighigh LIKE zchqlimit-zsighigh,

zsiglow LIKE zchqlimit-zsiglow,

END OF int_zchqlimit.

READ TABLE input WITH KEY 'REGUH-RBETR'.

IF sy-subrc = 0.

write input-value TO totpayment . -

>

ENDIF.

at arrow mark actual input-value is 12358 for given input but after moving into totpayment the value is showing as 2020202020.28

please i need advice why it is occuring like that.