#include <stdio.h>

int main(){
int N, M, C[100001],i;
int count = 0;

scanf("%d%d", &N,&M);
for (i = 0; i < N; i++) {
	scanf("%d", &C[i]);
}
i = 0;
while(M > 0){
	if (C[i] > 0) {
		M--;
		C[i]--;
		if (C[i] == 0) {
			i++;
			count++;
		}
	}
	else {
		i++;
		count++;
	}
}
printf("%d", count);

}