// yukicoder: No.710 チーム戦
// 2019.8.4 bal4u

#include <stdio.h>
#include <string.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in() {   // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int dp[102][100005];

int main()
{
	int i, j, N, ma, a, b;
	int *p;
	
	memset(dp, -1, sizeof(dp));
	N = in();
	dp[0][0] = 0, ma = 0;
	for (i = 1; i <= N; i++) {
		a = in(), b = in();
		for (j = ma; j >= 0; j--) if (dp[i-1][j] >= 0) {
			p = &dp[i][j+a];
			if (*p < 0 || *p > dp[i-1][j]) *p = dp[i-1][j];
			if (j+a > ma) ma = j+a;
				
			p = &dp[i][j];
			if (*p < 0 || *p > dp[i-1][j]+b) *p = dp[i-1][j]+b;
		}
	}
	a = 100005;
	for (i = 0; i <= ma; i++) if ((b = dp[N][i]) >= 0) {
		if (i > b) b = i;
		if (b < a) a = b;
	}
	printf("%d\n", a);
	return 0;
}