#include <cstdio>
int main(){
int N;
while(scanf("%d", &N) != EOF){
int start[25], end[25], Min = 0;
for(int i = 0; i < N; i++) scanf("%d", &start[i]);
for(int i = 0; i < N; i++){
scanf("%d", &end[i]);
if(start[i] > end[i]) Min += start[i]-end[i];
}
printf("%d\n", Min);
}
return 0;
}
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