#include<stdio.h>
#include<ctype.h>
void main(){
    int pamt;
    int ab;
    int check;
    if(scanf("%d%d%d",&pamt,&ab,&check)!=3){
        printf("Invalid input");
    }
    else if(a_bal<pamt){
        printf("Insufficient Balance");
        
    }
    else{
        bal = ab-pamt;
        printf("%.2f",bal);
    }
    
}