#include<stdio.h>
int main(){
    int m,t,s,a;
    scanf("%d %d %d",&m,&t,&s);
    if(t==0){printf("%d",0);
        
    }else if(t>0){if (s%t!=0){a=m-1-s/t;
         printf("%d",a);
    }else if(s%t==0){a=m-s/t;
         printf("%d",a);
        
    }
        
    }

        
   
    return 0;
}