#include <cstdio>
#include <cmath>
int main() 
{
	double k, p, s, years;				
	scanf("%lf %lf %lf", &k, &p, &s);
	if( s<=k )
	{
		years=0;
		printf("%ld", years);
	}
	else
	{
		years = log( s/k )/log( 1 + (p/100) );
		//применяя функцию округления до ближайшего большего целого, рассчитать количество лет
		printf("%2.0lf", ceil(years) );
	}
	return 0;
}
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