#include <stdio.h>
int main(){
int n,k,m;
int sum;
if (scanf("%d %d %d",&n,&k,&m)!=EOF){
sum = n-k*m;
}
printf("%d",sum);
return 0;
}
#include <stdio.h>
int main(){
int n,k,m;
int sum;
if (scanf("%d %d %d",&n,&k,&m)!=EOF){
sum = n-k*m;
}
printf("%d",sum);
return 0;
}天 : 20275
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