# include<stdio.h>

int main(){
    int m,n;
    scanf("%d\n%d\n",&m,&n);
    int drugs[n];
    int temp=0;
    int result, rejection;
    for (int i=0; i<n; i++){
        scanf("%d",&drugs[i]);
        temp += drugs[i];
        if (temp <= m){
            result++;
        }else{
            rejection++;
        }
    }
    printf("%d", rejection);
    return 0;
}