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#include <cstdio>

long long int power[] = {1LL, 10LL, 100LL, 1000LL, 10000LL, 100000LL, 1000000LL, 10000000LL, 100000000LL, 1000000000LL, 10000000000LL, 100000000000LL, 1000000000000LL, 10000000000000LL, 100000000000000LL, 1000000000000000LL, 10000000000000000LL, 100000000000000000LL, 1000000000000000000LL};

int getDigitsCount(long long int x) {
	int res = 0;
	while (x>0) {
		res++;
		x/=10;
	}
	return res;
}

long long int getNumberBegin(long long int x, int len) {
	while (x >= power[len]) x/=10;
	return x;
}

int main() {
	int N;
	long long int result = 0;
	long long int begin = 0;
	long long int extra = 0;

	scanf("%d",&N);
	for (int i=0; i<N; ++i) {
		long long int a;
		scanf("%lld",&a);

		if (a>begin) {
			begin = a;
		} else {
			int dc = getDigitsCount(a);
			long long int x = getNumberBegin(begin, dc);
			if (a != x || getNumberBegin(begin+1, dc) != x) {
				while (a <= begin) {
					a=a*10;
					result++;
				}
				result+=extra;
				begin = a;
				if (begin>power[17]) {
					begin/=10;
					extra++;
				}
			} else {
				result += getDigitsCount(begin)-dc+extra;
				begin = begin+1;
			}
		}
	}

	printf("%lld\n", result);
	return 0;
}