#include <cstdio>
int main()
{
double p = 0; scanf( "%lf", &p );
double k = 0; scanf( "%lf", &k ); k /= 100; //перевод процентов в вид для расчетов
double t = 0; scanf( "%lf", &t );
int years = 0;
if ( (p*(1 + k)-t) < p ) //если прирост не компенсирует вырубку
{
while( p > 0 )
{
p = p * ( 1 + k ) - t;
years++;
}
printf( "%d", years );
}
else
{
printf("Никогда: система гармонична. ");
}
return 0;
}
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