Where can be error?
#include <iostream>
int main()
{
    int k,s,t=0;
    scanf("%d%d",&k,&s);
    for (long int p=1; p<k; t++)
        p+=(p>s)?s:p;
    printf("%ld",t);
    return 0;
}

I think you can try this one:
[code deleted]

Edited by moderator 24.11.2019 12:47

Try this test:

input: 1000000000 1
output: 999999999

Time is money ;)