C :

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	int a,b;
	while(scanf("%d %d",&a,&b)!=EOF){
	if(a>=200){
		printf("1\n");
	}
	else{
		int c;
		double d=200,e=(100.+b)/100.,f=a;
		for(c=1;c<=19;c++){
			d=d*e;
			f=f+a;
			if(f>d){
				printf("%d\n",c+1);
				break;
			}
		}
		if(f<d){
			printf("Impossible\n");
		}
	}
    }
	return 0;
}